pls help

pic is below:

Pls Help Pic Is Below:

Answers

Answer 1

She rewrites the given equation in the following way as: (x + 10)² = 82.

What is equation?

An equation is a mathematical statement that shows the equality between two expressions. It contains one or more variables, which represent unknown values, and may involve mathematical operations such as addition, subtraction, multiplication, division, exponents, and roots. The goal of an equation is to find the value(s) of the variable(s) that make the equation true. Equations are used extensively in mathematics, physics, engineering, and other sciences to model and solve various real-world problems.

Here,

We can complete the square as follows:

x² + 20x + 18 = 0

x² + 20x = -18

(x + 10)² - 100 = -18 (adding and subtracting 100 to the left-hand side)

(x + 10)² = 82

Taking the square root of both sides, we get:

x + 10 = ±√(82)

x = -10 ± √(82)

So the correct answer is: (x + 10)² = 82.

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Related Questions

838
Discovering Solids Quiz
Geometry B (SP23) 3 / Area
1. How many faces, vertices, and edges are in the figure below?
faces= 6, vertices = 5, edges = 9
Ofaces= 5, vertices = 6, edges = 10
Ofaces = 7, vertices = 7, edges = 12
faces = 8, vertices = 8, edges = 8

Answers

The given figure is a hexagonal pyramid and it has 7 faces, 7 vertices, and 12 edges. The correct option is c)

What is hexagonal pyramid?

A hexagonal pyramid is a three-dimensional geometric figure that has a hexagonal base and triangular faces that meet at a common vertex. It is also known as a hexagonal pyramid or a hexagonal pyramid.

According to the given information:

The given shape is a Hexagonal pyramid

Here are the characteristics of a hexagonal pyramid:

Faces: 7 (1 hexagonal base and 6 triangular faces)

Vertices: 7 (1 common vertex where all the triangular faces meet and 6 vertices on the hexagonal base)

Edges: 12 (6 edges on the hexagonal base and 6 edges connecting the base to the common vertex)

So, a hexagonal pyramid has 7 faces, 7 vertices, and 12 edges.

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a classroom is arranged with 8 seats in the front row 10 seats in the middle row and 12 seats in the back what is the probability that that the first student who enters the room will be assigned to the front row

Answers

The probability that the first student who enters the room will be assigned to the front row is 4/15.

What is probability?

The probability of an event is calculated by dividing the total number of possible outcomes by the number of possible outcomes.

given that ,

A classroom is arranged with 8 seats in the front row 10 seats in the middle row and 12 seats

The total number of seats in the classroom is 8 + 10 + 12 = 30.

There are thirty seats to choose from because there is only one student entering the room.

However, we want to determine the likelihood that the student will be assigned to one of the eight seats in the front row.

Therefore, the probability of assigning the front row to the first student who enters the room is:

P(front row) = 8/30

Simplifying this fraction gives:

P(front row) = 4/15

As a result, there is a probability of 4/15, or roughly 0.267, that the first student who enters the room will be assigned to the front row.

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1. Find all exact solutions on [0, 2π). (Enter your answers as a comma-separated list. )2 cos2(t) + cos(t) = 1t =2. Find all exact solutions on [0, 2π). (Enter your answers as a comma-separated list. )2tan2(t) = −3 sec(t)t =3. Solve for 0 ≤ θ < π. (Enter your answers as a comma-separated list. )sin(θ) = sin(2θ)θ =4. Find all exact solutions on the interval [0, 2π). (Enter your answers as a comma-separated list. )cos(2t) = −sin(t)t =5. Find all exact solutions on the interval [0, 2π). Look for opportunities to use trigonometric identities. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE. )cos(2x) − cos(x) = 0x =

Answers

a) The exact solutions on [0, 2π) are t = π/3, π, and 5π/3. b) The exact solution on the interval [0, π) is t = 2π/3. c) The solutions are θ = π/3 and θ = 5π/3. d) The exact solutions on the interval [0, 2π) are: t = arcsin[(-1 +  [tex]\sqrt{41}[/tex])/4] and t = 2π - arcsin[(-1 +  [tex]\sqrt{41}[/tex])/4] using trigonometric identities.

a) We can rewrite the equation as:

2[tex]cos^{2}t[/tex] + cos(t) - 1 = 0

Using the quadratic formula, we get:

cos(t) = [-1 ± [tex]\sqrt{1-4(2)(-1)}[/tex] ] / (4)

cos(t) = [-1 ± [tex]\sqrt{9}[/tex]]/4

cos(t) = [-1 ± 3]/4

Thus, we have two solutions:

cos(t) = 1/2, which gives us t = π/3 and t = 5π/3

cos(t) = -1, which gives us t = π

Therefore, the exact solutions on [0, 2π) are t = π/3, π, and 5π/3.

b) We can use the identity [tex]tan^{2}t[/tex] + 1 = [tex]sec^{2}t[/tex] to rewrite the equation as:

[tex]tan^{2}t[/tex] = - [tex](3/2)^{2}[/tex]

Taking the square root of both sides and remembering that tan(t) is negative in the third quadrant, we get:

tan(t) = -3/2

Using the identity tan(t) = sin(t)/cos(t), we can rewrite this as:

sin(t)/cos(t) = -3/2

Multiplying both sides by cos(t) and rearranging, we get:

sin(t) = -3cos(t)/2

Squaring both sides and using the identity [tex]sin^{2}t[/tex] + [tex]cos^{2}t[/tex] = 1, we get:

9[tex]cos^{2}t[/tex]/4 + [tex]cos^{2}t[/tex] = 1

Expanding and simplifying, we get:

13 [tex]cos^{2}t[/tex] /4 = 1

[tex]cos^{2}t[/tex]  = 4/13

Taking the square root of both sides and remembering that cos(t) is negative in the third quadrant, we get:

cos(t) = -2[tex]\sqrt{13}[/tex] /13

Using the identity  [tex]sin^{2}t[/tex] +  [tex]cos^{2}t[/tex]  = 1, we can solve for sin(t) as:

sin(t) = -3/2 cos(t) = 3[tex]\sqrt{13}[/tex] /13

Therefore, the exact solution on the interval [0, π) is t = 2π/3.

c) We can use the identity sin(2θ) = 2sin(θ)cos(θ) to rewrite the equation as:

sin(θ) = 2sin(θ)cos(θ)

Dividing both sides by sin(θ) (assuming sin(θ) is non-zero), we get:

1 = 2cos(θ)

cos(θ) = 1/2

Therefore, the solutions are θ = π/3 and θ = 5π/3.

d) We can use the identity cos(2t) = 1 - 2 [tex]sin^{2}t[/tex]  and rearrange the equation as:

2 [tex]sin^{2}t[/tex]  + sin(t) - 5 = 0

Solving this quadratic equation using the quadratic formula, we get:

sin(t) = [-1 ± [tex]\sqrt{41}[/tex]]/4

Since the sine function has a range of [-1, 1], only the positive solution is possible, so we have:

sin(t) = (-1 + [tex]\sqrt{41}[/tex])/4

Using the identity [tex]cos^{2}t[/tex] = 1 -  [tex]sin^{2}t[/tex] , we can solve for cos(t) as:

cos(t) =[tex]\sqrt{1-sin^{2}t}[/tex] = [tex]\sqrt{17-\sqrt{41} }/4[/tex]

Therefore, the exact solutions on the interval [0, 2π) are:

t = arcsin[(-1 +  [tex]\sqrt{41}[/tex])/4] and t = 2π - arcsin[(-1 +  [tex]\sqrt{41}[/tex])/4]

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A trip to St. Louis from Atlanta will take 7¾ hours. Assuming you're two-thirds of the way there, how much longer, in hours, will the trip take?

Answers

Answer:

5 and 1/6 hours

Step By Step Explanation:

(8x10) +(4x1)+(5x1/100

Answers

The value of solution of the expressions are,

⇒ 84.05

We have to given that;

The expression is,

⇒ (8 × 10) + (4 × 1) + (5 × 1/00)

Now, We can simplify as;

⇒ (8 × 10) + (4 × 1) + (5 × 1/100)

⇒ 80 + 4 + (5 × 0.01)

⇒ 84 + 0.05

⇒ 84.05

Thus, the value of solution of the expressions are,

⇒ 84.05

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Once chosen, a score, event, or participant CANNOT be returned to the population to be selected again. This technique is referred to as
a. random sampling without replacement.
b. random sampling with replacement.
c. stratified random sampling.
d. convenience sampling.

Answers

The technique being described is random sampling without replacement, which is option a.

This technique is called "sampling without replacement."

However, you've also mentioned convenience sampling, which is a different method.

Let me briefly explain both concepts.

Sampling without replacement is a method in which each item, score, event, or participant is chosen from the population and is not returned to the pool for further selections.

This ensures that each element can only be selected once, eliminating the chance of duplication in the sample.

This method is often used in surveys, experiments, and research to maintain the independence of observations and provide a more accurate representation of the population.
Select an item, score, event, or participant from the population.
Record the selected item and remove it from the population.

Repeat steps 1-2 until the desired sample size is obtained.
Convenience sampling, on the other hand, is a non-probability sampling method where researchers select participants based on their accessibility and ease of recruitment.

This approach may introduce bias and limit the generalizability of the study results, as it does not ensure that the sample is representative of the population.
Identify the target population.
Recruit participants who are easily accessible and willing to participate.
Collect data from the selected participants.
In summary, sampling without replacement is a technique that prevents the same item from being selected more than once, while convenience sampling is an approach that focuses on selecting participants based on their accessibility. Both methods serve different purposes in research and should be chosen based on the study's objectives and available resources.

Option a is correct.

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Can somebody please help me with some of these math questions.

Answers

The ratio of the areas of two similar polygons is equal to the square of the ratio of their corresponding side lengths. Since the scale factor of the polygons is 3:8, the ratio of their corresponding side lengths is 3/8. Therefore, the ratio of their areas is (3/8)^2 = 9/64.

How to explain the ratio

The ratio of the areas of two similar circles is equal to the square of the ratio of their radii. Since the scale factor of the circles is 2:3, the ratio of their radii is 2/3. Therefore, the ratio of their areas is (2/3)^2 = 4/9. Since the area of the larger circle is 64π, the area of the smaller circle is (4/9) * 64π = 28.44π.

The ratio of the areas of two similar polygons is equal to the square of the ratio of their corresponding side lengths. Since the ratio of the areas of the two regular pentagons is 150√3/54√3 = 25/9, the ratio of their corresponding side lengths is the square root of the ratio of their areas, which is √(25/9) = 5/3. Therefore, the ratio of their perimeters is 5:3, since the perimeters of regular polygons are directly proportional to their side lengths.

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A deck of cards is shuffled, if we want to know the chance that the top card is the ace of spades or the bottom card is the ace of spades, we will use: Neither of the rules Addition rule Multiplication rule & Either of the rules

Answers

We will use the "Either of the rules" to calculate the probability that either the top card is the ace of spades or the bottom card is the ace of spades.

The either of the rules states that the probability of either of two mutually exclusive events occurring is the sum of their individual probabilities. In this case, the events are the top card being the ace of spades and the bottom card being the ace of spades. Since the two events are mutually exclusive (the ace of spades cannot be both at the top and at the bottom of the deck), we can add their probabilities to get the total probability.

The probability of the top card being the ace of spades is 1/52 (since there is only one ace of spades in the deck of 52 cards), and the probability of the bottom card being the ace of spades is also 1/52 (assuming that the deck has been sufficiently shuffled). Therefore, the probability of either the top card or the bottom card being the ace of spades is:

P(top or bottom is ace of spades) = P(top is ace of spades) + P(bottom is ace of spades)

= 1/52 + 1/52

= 2/52

= 1/26

So the chance that either the top card is the ace of spades or the bottom card is the ace of spades is 1/26 or approximately 0.038 or 3.8%.

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The probability is 2/52 or 1/26.

To find the chance that the top card is the ace of spades or the bottom card is the ace of spades, you will use the

Addition rule.

Calculate the probability of the top card being the ace of spades:

There are 52 cards in a deck, and 1 ace of spades, so the probability is 1/52.

Calculate the probability of the bottom card being the ace of spades:

This is also 1/52 since there's still 1 ace of spades among the 52 cards.

Apply the Addition rule:

Add the probabilities together, then subtract the probability of both events happening at the same time (which is 0, as

the ace of spades can't be in both positions).

So, the probability is (1/52) + (1/52) - 0 = 2/52 or 1/26.

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Factor ax-2bx + ay-2by

Answers

*factor x from the equation*
x x (a-2b)+ay-2by
*factor y from the equation*
x x (a-2b)+ y x (a-2b)
*factor out a-2b from the equation*
(a-2b) x (x+y) = ANSWER!

The grid you see below is in the shape of a rectangle. What is the area, in square
units, of the shaded part?

Answers

Answer:

12 square units

Step-by-step explanation:

interior angles of rectangles are right angles

Area of the triangle: 6 x 4 / 2

Quadrilateral ABCD​ is inscribed in this circle.



What is the measure of angle C?

Answers

The measure of angle C is 80°

What is a cyclic quadrilateral?

A cyclic quadrilateral is a quadrilateral which has all its four vertices lying on a circle. It can also be called inscribed quadrilateral.

A theorem if circle geometry states that the opposite angles of a cyclic quadrilateral are supplementary. This means the sum of. opposite angles of a cyclic quadrilateral is 180°

Therefore 3x-59+2x-1 = 180

5x -60 = 180

5x = 180+60

5x = 240

x = 240/5

x = 48

angle A = 2x+4 = 2×48+4

= 100°

therefore angle C = 180-(angle A)

C = 180-100

= 80°

therefore the measure of angle C is 80°

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Which scatter plot shows a negative nonlinear association?
A.
Scatter plot graph in quadrant 1 of a coordinate plane. 11 points are plotted approximated at (2, 5), (1.5, 11.5), (3.1, 6.1), (4, 9), (5.9, 12.5), (7, 6), (7.5, 8.5), (8, 11), (8.9, 4.1), (9, 8), and (11, 10).
B.
Scatter plot Graph on a coordinate plane. Closed points plotted at (3, 11), (3, 12), (4, 11), (4.2, 12), (5, 10.8), (5.4, 12), (6, 10), (6.5, 11), (6.9, 9), (7.1, 6), (7.1, 7.7), (7.8, 9), (8.1, 6.1), (8, 7.5).
C.
Scatter plot in quadrant 1 of a coordinate plane. 10 points are plotted at (2, 11), (2.5, 9), (3, 10), (4, 8), (5, 8.2), (5.5, 6.5), (6.5, 7), (6.5, 5), (8, 5.8), and (9, 4).
D.
Scatter plot in quadrant 1 of a coordinate plane. 10 points are plotted at (2, 3), (2.8, 4.2), (3.8, 3.2), (4, 4.6), (4, 6), (5, 5), (6, 8), (7, 7), (7.8, 9.2), and (8.9, 9.1).

Answers

The scatter plot that shows a negative nonlinear association is option C.

What is scatter plot?

A scatter plot is a type of graph that displays the relationship between two variables. It is used to show how much one variable is affected by another variable. One variable is plotted on the horizontal axis (x-axis) and the other variable is plotted on the vertical axis (y-axis).

Here,

In this scatter plot, as the x-axis values increase, the y-axis values initially increase and then decrease. This type of association is referred to as a negative nonlinear association, where the direction of the association is negative (decreasing) and the shape of the association is nonlinear (not a straight line). The other options either show a positive association (increasing values of x and y) or a linear association (a straight line).

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The Wigwam Motel in Holbrook, Arizona is famous for its large tepees, which are shaped like cones. Each of these units has a base diameter of 14 feet and a height of 32 feet. (a) What is the slant height of the Teepees at the Wigwam Motel? Please make sure to use the Pythagorean Theorem and show your work. (b) (1. 5 pts) For extra credit, how much floor space, in square units, is available inside each tepee?

Answers

The Wigwam Motel in Holbrook, Arizona is famous for its large tepees shaped like cones. the floor space inside each tepee is approximately 153.94 square feet.

(a) To find the slant height of the tepee, we can use the Pythagorean theorem. The slant height is the hypotenuse of a right triangle with the height and the radius of the base as the legs.

The radius of the base is half of the diameter, so r = 14/2 = 7 feet. The height of the tepee is 32 feet. Let's call the slant height "s".

Using the Pythagorean theorem, we have:

s² = r² + h²

s² = 7² + 32²

s² = 49 + 1024

s² = 1073

s = sqrt(1073)

s ≈ 32.77 feet

Therefore, the slant height of the tepee is approximately 32.77 feet.

(b) To find the floor space inside the tepee, we need to calculate the area of the circular base. The formula for the area of a circle is A = πr², where A is the area and r is the radius.

A = π(7)²

A = 49π

A ≈ 153.94 square feet

Therefore, the floor space inside each tepee is approximately 153.94 square feet.

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It's a math problem about graphing. thank you

Answers

The interval for which the ball's height is increasing on the graph, would be 0 seconds to 1.5 seconds.

What is the interval the ball's height increases ?

The interval for which the ball's height is increasing is when the slope of the graph is positive, or when the height is increasing with respect to time.

Looking at the graph, we can see that the ball starts at a height of 0 meters and reaches a peak of 11.025 meters at 1.5 seconds. After 1.5 seconds, the ball begins to fall back to the ground.

Therefore, the interval for which the ball's height is increasing is from 0 seconds to 1.5 seconds. During this interval, the height of the ball is increasing as it travels upwards, reaching its peak at 1.5 seconds. After 1.5 seconds, the height of the ball starts decreasing as it falls back down to the ground.

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If the area was equal to 8w solve to find the values of w.
A=2w^2 - 16w

Answers

Answer:

hence the value of w is 12

Step-by-step explanation:

[tex]area = 2 {w}^{2} - 16w \\ by \: the \: question \: if \: area \: is \: equal \: to \: 8w \\ 8w = 2w {}^{2} - 16w \\ 8w + 16w = 2 {w}^{2} \\ 24w = 2 w {}^{2} \\ w = 12[/tex]

the table shows the number of people who rode two different carnival rides during the first hour of the fair on opening day. ferris wheel swing ride total children 72 24 96 adults 126 42 168 total 198 66 264 based on the data in the table, what is the approximate value of p(adult|rode a ferris wheel)?

Answers

The approximate value of P(adult ∣ rode a ferris wheel) is 0.6364, which is approximately 63.64%.

To find the approximate value of P(adult|rode a ferris wheel), we can use the conditional probability formula:

[tex]\mathrm{P(adult | rode\ a\ ferris\ wheel) = \frac{P(adult \ and \ rode \ a \ ferris \ wheel)}{P(rode \ a \ ferris \ wheel)} }[/tex]

From the data given in the table, you can see that:

Total number of people who rode the ferris wheel: 198 (children + adults)

Number of adults who rode the ferris wheel: 126.

So, P(rode a ferris wheel) = 198/264

And, P(adult and rode a ferris wheel) = 126/264

Now plug these values into the conditional probability formula:

​[tex]\mathrm{P(adult | rode\ a\ ferris\ wheel) = \frac{P(adult \ and \ rode \ a \ ferris \ wheel)}{P(rode \ a \ ferris \ wheel)} } \\\\= \frac{126/264}{198/264}[/tex]

[tex]\mathrm{P(adult | rode\ a\ ferris\ wheel) } = \frac{126}{198} \\\\ \approx 0.6364[/tex]

Rounded to four decimal places, the approximate value of P(adult ∣ rode a ferris wheel) is 0.6364, which is approximately 63.64%.

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please please please please please please please please help me out​

Answers

The predicted length for a catfish with weight of 48 pounds is given as follows:

45 inches.

How to define a linear function?

The slope-intercept representation of a linear function is given by the equation presented as follows:

y = mx + b

The coefficients of the function and their meaning are described as follows:

m is the slope of the function, representing the change in the output variable y when the input variable x is increased by one.b is the y-intercept of the function, which is the initial value of the function, i.e., the numeric value of the function when the input variable x assumes a value of 0. On a graph, it is the value of y when the graph of the function crosses the y-axis.

Two points on the graph of the linear function are given as follows:

(20, 3) and (30, 21).

When x increases by 10, y increases by 18, hence the slope m is given as follows:

m = 18/10

m = 1.8.

Hence:

y = 1.8x + b.

When x = 20, y = 3, hence the intercept b is given as follows:

3 = 1.8(20) + b

b = 3 - 36

b = -33.

Hence the equation is:

y = 1.8x - 33.

The predicted length for a catfish with weight of 48 pounds is obtained as x when y = 48, hence:

48 = 1.8x - 33

x = 81/1.8

x = 45 inches.

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Jordan studied for his science test for 2 ¼ hours on Saturday and 1 ½ hours Sunday. How many hours did he spend studying for science this weekend?

Answers

2 ¼ hours + 1 ½ hours = 3 ¾ hours

Jordan studied for his science test for 3 ¾ hours this weekend.

What is the purpose of science?

Science is a systematic process that produces knowledge in the form of testable predictions and universe-related explanations that can be organized and placed into order.

In general, science entails an effort to learn about universal truths or how fundamental laws work. Learning about the components of the universe and how they operate right now, in the past, and perhaps in the future is done through science.

Although science is intricate and multifaceted, its most significant traits are simple: Learning understanding what is in the natural world, how it functions, and how it came to be the way it is through science.

2 ¼ hours + 1 ½ hours = 3 ¾ hours

Jordan studied for his science exam for 3 ¾ hours this weekend.

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Jordan spent a total of 3 hours and 45 minutes studying for his science test this weekend.

what is arithmetic sequence.

An arithmetic sequence is a sequence of numbers in which each term after the first is found by adding a fixed constant number, called the common difference, to the preceding term.

Jordan studied for 2 ¼ hours on Saturday and 1 ½ hours on Sunday for his science test. To find the total number of hours he studied, we can add these two amounts.

2 ¼ hours is the same as 2 + ¼ hours, or 2 hours and 15 minutes.

So, we have:

2 hours and 15 minutes (Saturday) + 1 hour and 30 minutes (Sunday)

To add these two amounts, we can first add the hours and then add the minutes separately.

2 hours + 1 hour = 3 hours

15 minutes + 30 minutes = 45 minutes

Therefore, Jordan spent a total of 3 hours and 45 minutes studying for his science test this weekend.

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A basketball player was successful on 18 out of his 24 last free throws attempts. If he attempts 20 free- throws in the next game, about how many will he make if the ratio is the same as the first game?

Answers

He needs to make 15 throws if the ratio is the same as the first game


Calculating how many will he make if the ratio is the same as the first game?

From the question, we have the following parameters that can be used in our computation:

Player was successful on 18 out of his 24 last free throws attempts

Using the above as a guide, we have the following:

Proportion = 18/24

For the number of games, we have

Throws made = Proportion  * Number of throws

Substitute the known values in the above equation, so, we have the following representation

Throws made = 18/24 * 20

Evaluate

Throws made = 15

Hence, the number of throws made is 15

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Write an equation of the line that passes through (-4, 1) and is perpendicular to the line y = 2x + 3.

Answers

y=-1/2x-1 is equation of the line that passes through (-4, 1) and is perpendicular to the line y = 2x + 3

The slope intercept form of a line is y=mx+b, where m is slope and b is the y intercept.

The slope of line passing through two points (x₁, y₁) and (x₂, y₂) is

m=y₂-y₁/x₂-x₁

We have to find the  equation of the line that passes through (-4, 1) and is perpendicular to the line y = 2x + 3.

The slope of given line is 2

The slope of perpendicular line is -1/2

Now let us find the y intercept

1=-1/2(-4)+b

1=2+b

b=-1

Now the equation is y=-1/2x-1

Hence,  equation of the line that passes through (-4, 1) and is perpendicular to the line y = 2x + 3 is y=-1/2x-1.

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Please help! Equation is below.

Answers

The values of a that make (x - a) a factor of x^4 - 5x³ - 21x² - 23x - 8 are given as follows:

a = 8 and a = -1.

How to obtain the values of a?

The polynomial is given as follows:

f(x) = x^4 - 5x³ - 21x² - 23x - 8

By the factor theorem, x - a is a factor of a polynomial f(x) if f(a) = 0.

The numeric value at x = a is given as follows:

f(a) = a^4 - 5a³ - 21a² - 23a - 8.

Hence the values of a are obtained solving the equation presented as follows:

a^4 - 5a³ - 21a² - 23a - 8 = 0.

Using a calculator, the values of a are given as follows:

a = 8 and a = -1.

(the root of -1 has a multiplicity of 3).

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What is 15.98 round to the nearest tenth

Answers

Answer:

16

Step-by-step explanation:

To round 15.98 to the nearest tenth, we look at the digit in the hundredths place which is 8. Since 8 is greater than or equal to 5, we round up the digit in the tenths place which is 9. Therefore, rounding 15.98 to the nearest tenth gives us 16.

Answer:

16

Step-by-step explanation:

15 . 98

8 round up is 10

0.10 + 0.9 = 1

15 + 1 = 16

You may need to use the appropriate appendix table or technology to answer this question. The following results are for independent random samples taken from two populations. Sample 1 Sample 2 n1 = 20 n2 = 30 x1 = 22.8 x2 = 20.1 s1 = 2.2 s2 = 4.6 (a) What is the point estimate of the difference between the two population means? (Use x1 − x2. ) 2.7 (b) What is the degrees of freedom for the t distribution? (Round your answer down to the nearest integer.) (c) At 95% confidence, what is the margin of error? (Round your answer to one decimal place.) (d) What is the 95% confidence interval for the difference between the two population means? (Use x1 − x2. Round your answers to one decimal place.)

Answers

a). The difference between the two population means is estimated at a location to be 2.7.

b). 49 different possible outcomes make up the t distribution. The margin of error at 95% confidence is 1.7.

c). The range of the difference between the two population means' 95% confidence interval is (0.0, 5.4).

d). The (0.0, 5.4) represents the 95% confidence interval for the difference among the two population means.

What is standard deviations?

The variability or spread in a set of data is commonly measured by the standard deviation. The deviation between the values in the data set and the mean, or average, value, is measured. A low standard deviation, for instance, denotes a tendency for data values to be close to the mean, whereas a high standard deviation denotes a larger range of data values.

Using the equation [tex]x_1-x_2[/tex], we can determine the point estimate of the difference between the two population means. In this instance, we calculate the point estimate as 2.7 by taking the mean of Sample

[tex]1(x_1=22.8)[/tex] and deducting it from the mean of Sample [tex]2(x_2=20.1)[/tex].

With the use of the equation [tex]df=n_1+n_2-2[/tex], it is possible to determine the degrees of freedom for the t distribution. In this instance, the degrees of freedom are 49 because [tex]n_1[/tex] = 20 and [tex]n_2[/tex] = 30.

We must apply the formula to determine the margin of error at 95% confidence [tex]ME=t*\sqrt[s]{n}[/tex].

The sample standard deviation (s) is equal to the average of [tex]s_1[/tex] and [tex]s_2[/tex] (3.4), the t value with 95% confidence is 1.67, and n is equal to the

average of [tex]n_1[/tex] and [tex]n_2[/tex] (25). When these values are entered into the formula, we get [tex]ME=1.67*\sqrt[3.4]{25}=1.7[/tex].

Finally, we apply the procedure to determine the 95% confidence interval for the difference between the two population means [tex]CI=x_1-x_2+/-ME[/tex].

The confidence interval's bottom limit in this instance is [tex]x_1-x_2-ME2.7-1.7=0.0[/tex] and the upper limit is [tex]x_1+x_2+ME=2.7+1.7=5.4[/tex].

As a result, the (0.0, 5.4) represents the 95% confidence interval for the difference among the two population means.

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the scatter graph shows the maximum temperature and the number of hours of sunshine in 13

Answers

The coordinates of the point which is an outlier would be ( 14, 13).

The correlation between the 13 British towns is Linear.

The number of hours of sunshine for the British town with the maximum of 17.4 degrees Celsius is 13 hours of sunshine.

How to find the hours of sunshine ?

The coordinates of the outlier would be ( 14, 13). This is because, that point on the graph is far from the other points and does not follow their correlation.

The rest of the towns seem to be increasing in the same direction so they are linear.

The number of hours of sunshine in the British town with the maximum temperature of 17.4 degrees Celsius, based on the line of best fit drawn, would be 13 hours of sunshine.

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Full question is:

The scatter graph shows the maximum temperature and the numbers of hours of sunshine in 13 British towns in one day.

A line of best fit has also been drawn.

One of the points in an outliner.

a) Write down the coordinates of this point. (1)

b) For all the other points write down the type of correlation in just one word. (1)

On the same day, in another British town, the maximum temperature was 17.4C.

c) Estimate the number of hours of sunshine in this town on this day. (2)

pls hlp thx so much !!!!!!!!!!!!!!

Answers

On solving the provided question, we can say that

the measurement of angle B is 40 degrees.

What is equation?

A mathematical equation is a formula that connects two statements and denotes equivalence with the equals symbol (=). An equation is a mathematical statement that shows the equality of two mathematical expressions in algebra. In the equation 3x + 5 = 14, for example, the equal sign separates the variables 3x + 5 and 14.

A mathematical formula describes the connection between the two sentences that occur on opposite sides of a letter. The symbol and the single variable are frequently the same. As in 2x - 4 equals 2, for instance.

Supplementary angles add up to 180 degrees. Therefore, we can write the equation:

A + B = 180

Substituting the given expressions for A and B, we get:

(4x - 16) + (x + 1) = 180

Simplifying the left side, we get:

5x - 15 = 180

Adding 15 to both sides, we get:

5x = 195

Dividing both sides by 5, we get:

x = 39

Therefore, the measurement of angle B is:

B = x + 1 = 39 + 1 = 40 degrees.

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a rancher has 10,000 linear feet of fencing and wants to enclose a rectangular field and then divide it into two equal pastures, with an internal fence parallel to one of the rectangular sides. what is the maximum area of each pasture? round to the nearest square foot.

Answers

For a 10,000 linear feet of fencing and wants to enclose a rectangular field, the maximum area of each pasture is equals to the 2,083,333.33 square feet .

A rancher wants to enclose about 10,000 linear feet of fencing in a rectangular field. There are two equal pastures. Let, W the Width and L the Length with 3 pieces. The total length will be equal to 2W + 3L. As we know, the Area of rectangle, A = L×W ---(1)

Perimeter of rectangle = 10,000 feet, so sum of all sides of rectangle, 2W + 3L = 10000

Solve for determining value of L, 3L

= 10000 - 2W

[tex]L = \frac{ 10000 - 2W }{3}[/tex]

Substitutes for L into the first equation, A = L×W

[tex]A = W(\frac{ 10000 - 2W }{3})[/tex]

For maximum area, set the 1st derivative = 0.

differentiating above Area equation w.r.t W,[tex] A = \frac{(10000 \: W - 2W^2)}{3}[/tex]

[tex] \frac{dA}{dW} = \frac{d(\frac{10000 \: W - 2W^2}{3})}{dW}[/tex]

=> [tex]\frac { 1}{3}(10000 - 4W) = 0 [/tex]

=> W = 2500 meters

Now, using above relation, 2W + 3L= 10000

=> 5000 + 3L = 10000

=> 3L = 5000

=> L = 1667 meters

Area = 2500× 5000/3 = 4,166,666.67 sq feet. Now, maximum area of each pasture

= 4,166,666.67/2 = 2,083,333.33333 sq. feet. Hence, required value is 2,083,333.33 sq. feet.

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Question 1
Find the future value twenty-five years from now of an account in which you have $19,675.13 today and into which you make annual $3,000 deposits. Assume the account earns 9.25%.

Answers

As a result, the account will be worth $398,634.52 in 25 years as by estimating the future worth of the yearly deposits.

what is interest ?

Interest is the fee incurred when paying interest or the compensation given when lending money. The principal, which is the obtain desired or lent, is typically stated as a percentage. The period, and or duration for which the principal is lent or invested, as well as the interest rate determine how much interest is charged or generated. There are two types of interest: simple and compound. Compound interest is calculated based on the original and the total interest.

given

Let's begin by estimating the future worth of the yearly deposits:

[tex]$3000 * ((1 + 0.0925)25 - 1) / 0.0925[/tex] = $263,361.05 FV annuity

Then, let's determine the initial deposit's future value:

FV initial is $19,675.13 multiplied by (1 + 0.0925)25 to get $135,273.47.

Let's finally combine the two future numbers to determine the account's total future value:

$135,273.47 + $263,361.05 = $398,634.52

where FV total = FV initial + FV annuity

As a result, the account will be worth $398,634.52 in 25 years as by estimating the future worth of the yearly deposits.

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rebecca and michael took a survey of the number of siblings that each of their classmate had. what percent of the total classmates have 2 siblings

Answers

The percentage of total classmates that have 2 siblings is calculated as follows:

Percentage = number of students with 2 siblings / total number of students x 100%.

How to obtain the percentage?

Before obtaining the percentage, we must obtain the proportion, which is given by the division of the number of desired outcomes by the number of total outcomes, as follows:

number of students with 2 siblings / total number of students.

Then the percentage is obtained multiplying by 100%, as follows:

Percentage = number of students with 2 siblings / total number of students x 100%.

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Bob's gift shop sold a record number of cards for Mother's Day. One salesman sold 46 cards, which was 10% of the cards sold for Mother's Day. How many cards were sold for Mother's Day?

Answers

The total 460 cards are sold on Mothers day.

Given that, Bob's gift shop sold a record number of cards for Mother's Day.

One salesman sold 46 cards, which was 10% of the cards sold for Mother's Day.

Let the number of cards sold on mothers day be x.

Here, 10% of x =46

10/100 ×x= 46

10x=4600

x=460

Therefore, total 460 cards are sold on Mothers day.

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for the integer data set containing 11, 13, 15, 17, x, and y, the unique mode, median, and mean form an increasing arithmetic sequence, in that order. what is the greatest possible value of y?

Answers

Given the integer data set containing 11, 13, 15, 17, x, and y, we know that the mode, median, and mean form an increasing arithmetic sequence.

Since the mode is the unique number that appears most frequently, either x or y must be equal to one of the existing numbers (11, 13, 15, or 17). Let's assume x is the mode. For the sequence to be increasing, the mode must be the smallest, so x = 11.

The median of the data set is the average of the two middle numbers when they are arranged in ascending order. With x = 11, the sorted sequence will be 11, 11, 13, 15, 17, and y. The median will be the average of 11 and 13, which is 12.

For the mean, we have (11+11+13+15+17+y)/6. We know the mean is greater than the median, which is 12. If we increase the mean to 13, we can solve for y:

(11+11+13+15+17+y)/6 = 13
67 + y = 78
y = 11

However, this would make the mode 11 as well, so it doesn't meet the unique requirement. Let's increase the mean to 14 and solve for y:

(11+11+13+15+17+y)/6 = 14
67 + y = 84
y = 17

Now, the mode, median, and mean are unique and form an increasing arithmetic sequence (11, 12, 14). Therefore, the greatest possible value of y is 17.

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