In 1995, an early social media pioneer implemented the freemium business model, offering users the ability to create web pages within a community (topic) by providing basic services for free and charging for additional features.
In 1995, GeoCities introduced the freemium business model to the social media landscape. GeoCities allowed users to create personalized web pages with text and pictures within various thematic communities. The freemium model offered basic services for free, allowing users to create and host their web pages. However, GeoCities also provided additional features and enhancements for which users had to subscribe and pay.
This business model proved to be successful as it attracted a large user base and allowed GeoCities to generate revenue from subscribers who wanted access to premium features. By offering a free platform with limited functionality and enticing users with paid upgrades, GeoCities capitalized on the concept of the freemium model, providing a valuable interest while monetizing certain aspects of it.
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I WILL MARK BRAINLIEST
Answer:
GF = 25
Step-by-step explanation:
Δ DFE and Δ GFH are similar , by the AA postulate , then the ratios of corresponding sides are in proportion , that is
[tex]\frac{GF}{DF}[/tex] = [tex]\frac{FH}{FE}[/tex] ( substitute values )
[tex]\frac{GF}{40}[/tex] = [tex]\frac{GF+5}{48}[/tex] ( cross- multiply )
48 GF = 40(GF + 5) ← distribute parenthesis
48 GF = 40 GF + 200 ( subtract 40 GF from both sides )
8 GF = 200 ( divide both sides by 8 )
GF = 25
A merchant bought a quintal of potatoes for Rs 4000. During the times the price of potatoes was reduced by rupee 1 per kg, find his loss percent
The loss percentage for the merchant is 2.5%.
The merchant bought a quintal of potatoes, which is equal to 100 kg.
The initial cost of the potatoes is Rs 4000.
The price of potatoes was reduced by Rs 1 per kg.
Initially, the cost of 1 kg of potatoes is Rs 4000 / 100 kg = Rs 40 per kg.
After the reduction, the cost of 1 kg of potatoes becomes Rs 40 - Rs 1 = Rs 39 per kg.
The total cost after the reduction is 100 kg × Rs 39/kg = Rs 3900.
Now, we can calculate the loss
Loss = Initial cost -Final cost
Loss = Rs 4000 - Rs 3900
Loss = Rs 100
To calculate the loss percentage, we can use the formula
Loss percentage = (Loss / Initial cost) × 100
Substituting the values:
Loss percentage = (Rs 100 / Rs 4000) × 100
Loss percentage = 2.5%
Therefore, the loss percentage for the merchant is 2.5%.
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Unit 7: Quantifying Uncertainty: Probability, Binomial, and Normal Distributions
In a mathematics competition, students try
to find the correct answer from five options
in a multiple choice exam of 25 questions.
Alex decides his best strategy is to guess all
the answers.
a. State an appropriate model for the
random variable A = the number of
questions Alex gets correct.
Find the probability that the number of
questions that Alex gets correct is:
b. at most five c at least seven
d no more than three,
e. Write down E(/4) and interpret this
value.
f. Find the probability that Alex scores
more than expected.
g. In the test, a correct answer is awarded
4 points. An incorrect answer incurs a
penalty of 1 point. If Alex guesses all
questions, find the expected value of his
total points for the examination,
h. Four students in total decide to guess all
their answers. Find the probability that
at least two of the four students will get
seven or more questions correct.
a. The appropriate model for the random variable A is the binomial distribution.
b. The probability that Alex gets at most five questions correct can be calculated using the binomial distribution formula.
c. The probability that Alex gets at least seven questions correct can also be calculated using the binomial distribution formula.
d. The probability that Alex gets no more than three questions correct can be calculated using the binomial distribution formula.
e. E(A/4) represents the expected value of A divided by 4, which is the average number of correct answers Alex is expected to get per question.
f. The probability that Alex scores more than expected would depend on the specific values of the expected value and the distribution of the random variable.
g. The expected value of Alex's total points can be calculated by multiplying the expected number of correct answers by 4 and subtracting the expected number of incorrect answers multiplied by 1.
h. The probability that at least two of the four students will get seven or more questions correct would involve calculating the probabilities for each possible combination of students using the binomial distribution and summing them up.
What is probability?
Probability is a measure or quantification of the likelihood of an event occurring. It is a numerical value assigned to an event, indicating the degree of uncertainty or chance associated with that event.
a. The appropriate model for the random variable A, the number of questions Alex gets correct, is the binomial distribution.
b. To find the probability that the number of questions Alex gets correct is at most five, we need to calculate P(A ≤ 5) using the binomial distribution formula.
This involves summing up the probabilities of getting 0, 1, 2, 3, 4, or 5 questions correct. The specific values will depend on the probability of guessing a question correctly.
c. To find the probability that the number of questions Alex gets correct is at least seven, we need to calculate P(A ≥ 7) using the binomial distribution formula. This involves summing up the probabilities of getting 7, 8, 9, ..., 25 questions correct. Again, the specific values will depend on the probability of guessing a question correctly.
d. To find the probability that the number of questions Alex gets correct is no more than three, we need to calculate P(A ≤ 3) using the binomial distribution formula. This involves summing up the probabilities of getting 0, 1, 2, or 3 questions correct.
e. E(A/4) represents the expected value of A divided by 4. The expected value is calculated by multiplying each possible outcome by its probability and summing them up. Dividing by 4 scales down the expected value. The interpretation of E(A/4) is the average number of correct answers Alex is expected to get per question.
f. To find the probability that Alex scores more than expected, we would need to compare the actual number of questions he gets correct to the expected value. The probability would depend on the specific values of the expected value and the distribution of the random variable.
g. If a correct answer is awarded 4 points and an incorrect answer incurs a penalty of 1 point, we can calculate the expected value of Alex's total points by multiplying the expected number of correct answers by 4 and subtracting the expected number of incorrect answers and multiply it by 1.
h. To find the probability that at least two of the four students will get seven or more questions correct, we would need to calculate the probabilities for each possible combination of students getting seven or more questions correct (e.g., 2 students, 3 students, 4 students) using the binomial distribution, and sum them up.
a. The appropriate model for the random variable A is the binomial distribution.
b. The probability that Alex gets at most five questions correct can be calculated using the binomial distribution formula.
c. The probability that Alex gets at least seven questions correct can also be calculated using the binomial distribution formula.
d. The probability that Alex gets no more than three questions correct can be calculated using the binomial distribution formula.
e. E(A/4) represents the expected value of A divided by 4, which is the average number of correct answers Alex is expected to get per question.
f. The probability that Alex scores more than expected would depend on the specific values of the expected value and the distribution of the random variable.
g. The expected value of Alex's total points can be calculated by multiplying the expected number of correct answers by 4 and subtracting the expected number of incorrect answers multiplied by 1.
h. The probability that at least two of the four students will get seven or more questions correct would involve calculating the probabilities for each possible combination of students using the binomial distribution and summing them up.
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Determine if the situation can be modeled by a linear function or an exponential function: Sarah's fees decrease by $5 each time she visits the chiropractor
The situation described can be modeled by a linear function.
In a linear function, the relationship between the variables is constant and can be represented by a straight line on a graph. In this case, as Sarah's visits to the chiropractor increase, her fees decrease by a fixed amount of $5 each time. This means that there is a constant rate of change between the number of visits and the corresponding decrease in fees.
Let's say the number of visits is represented by the variable 'x' and the fees by the variable 'y'. The relationship can be expressed as:
y = mx + b
Where 'm' represents the rate of change (in this case, -5 because the fees decrease by $5) and 'b' represents the initial fee or the y-intercept.
Therefore, the situation of Sarah's fees decreasing by $5 each time she visits the chiropractor can be modeled by a linear function.
American jurists ____ and ____ defined law in a functional sense as predictions of the way that a court will decide specific legal questions.
American jurists (fill in the names) defined law as predictions of how a court will decide specific legal questions, based on a functional perspective.
American jurists Oliver Wendell Holmes Jr. and Benjamin Cardozo are known for their functionalist approach to defining law. They viewed law not merely as a set of abstract principles or rules, but as a prediction of how courts will decide specific legal questions in practice. According to their perspective, the law should be seen as a dynamic and evolving system that adapts to societal changes and reflects the judgments and decisions of the judiciary. By emphasizing the functional aspect of law, Holmes and Cardozo recognized the importance of considering how legal principles are actually applied and interpreted in real-world scenarios. Their approach acknowledges that the interpretation and application of law by judges can vary and evolve over time, depending on factors such as legal precedent, social context, and the specific facts of the cases before them.
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Amy teaches the four-year-old class at a local preschool. After taking her college psychology class, Amy determines that the majority of her students will be dealing with which psychosocial crisis
Given statement solution is :- If Preschool Psychosocial Crisis: Initiative children are discouraged, criticized, or experience excessive guilt for their actions, they may develop a sense of inadequacy or guilt.
Based on Erik Erikson's theory of psychosocial development, the majority of four-year-old children will be dealing with the psychosocial crisis known as "Initiative vs. Guilt." This stage typically occurs between the ages of three and six.
During this stage, children are eager to take on new tasks and assert their independence. They begin to develop a sense of purpose and initiative, exploring their surroundings, engaging in imaginative play, and expressing their ideas and desires. They may initiate games and activities, make decisions, and demonstrate a growing sense of autonomy.
However, if Preschool Psychosocial Crisis: Initiative children are discouraged, criticized, or experience excessive guilt for their actions, they may develop a sense of inadequacy or guilt. It is crucial for adults, such as teachers and parents, to provide a supportive environment that encourages the child's curiosity, initiative, and independence while setting appropriate limits and boundaries.
In the preschool setting, Amy can foster the resolution of this psychosocial crisis by allowing her students to engage in imaginative play, providing opportunities for decision-making and problem-solving, encouraging their creativity and independence, and offering praise and constructive feedback to build their self-confidence.
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Copyright protection for works of authorship available through the Internet is expressly provided by: a. The Berne Convention. b. The WIPO Copyright Treaty. c. The TRIPS Agreeme
Copyright protection for works of authorship available through the Internet is expressly provided by the WIPO Copyright Treaty (b).
The WIPO Copyright Treaty (WCT) specifically addresses copyright protection in the digital environment, including works of authorship available through the Internet. The treaty was adopted in 1996 by member states of the World Intellectual Property Organization (WIPO). It aims to address the challenges posed by digital technologies and the Internet to the protection of copyright. The WCT provides a framework for protecting digital works, ensuring that authors' rights are respected and their works are protected from unauthorized copying, distribution, and other forms of infringement. Therefore, the WIPO Copyright Treaty is the international agreement that expressly provides copyright protection for works of authorship available through the Internet.
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The HRM Cafe desires to rent space for a second location. A lessor with sufficient space proposes either a fixed costs of $5,000 per month or 5% of monthly sales. Which option costs less if annual revenue is expected to be $120,000
If the HRM Cafe expects to generate $120,000 in annual-revenue, renting space with a monthly cost of 5% of sales which is variable cost would be the cheaper option.
To determine which option costs less for the HRM Cafe, we need to compare the total costs of each option.
Option 1: Fixed costs of $5,000 per month.
This means that the monthly rent will always be $5,000 regardless of how much revenue the cafe generates.
Annual rent cost = $5,000 x 12 months = $60,000
Option 2:Variable costs: 5% of monthly sales.
This means that the monthly rent will be a percentage of the cafe's monthly sales.
Monthly rent cost = 5% x $120,000 (annual revenue) / 12 months = $500
Annual rent cost = $500 x 12 months = $6,000
Comparing the two options, we can see that option 2 (5% of monthly sales) costs less at an annual rent cost of $6,000 compared to option 1's annual rent cost of $60,000.
The variable rent option, which is 5% of monthly sales, costs less for HRM Cafe's second location.
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A triangle has sides of lengths 6x, 8x + 2, and 10x. If the perimeter of the triangle is 122, what is the length of the longest side?
The length of the longest side is 50 units based on the stated length of sides and perimeter.
As per the relation between sides of triangle and it's perimeter, the formula is -
Side + side + side = perimeter
Keeping the values in formula to find the value of x
6x + 8x + 2 + 10x = 122
Performing addition on Left Hand Side of the equation
24x + 2 = 122
Rearranging the equation
24x = 122 - 2
Subtract the values
24x = 120
x = 120/24
Performing division on Right Hand Side
x = 5
Length of each side = 6×5 + ((8×5)+2), 10×5
Length = 30, 42, 50
Hence, the length of the longest side is 50.
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Zhang Industries budgets production of 210 units in June and 220 units in July. Each unit requires 1.5 hours of direct labor. The direct labor rate is $12.20 per hour. The indirect labor rate is $19.20 per hour. Compute the budgeted direct labor cost for July.
To compute the budgeted direct labor cost for July at Zhang Industries, we multiply the number of units produced in July (220 units) by the direct labor hours per unit (1.5 hours) and the direct labor rate ($12.20 per hour).
To calculate the budgeted direct labor cost for July, we use the formula:
Budgeted Direct Labor Cost = Number of Units * Direct Labor Hours per Unit * Direct Labor Rate
In this case, the number of units produced in July is 220 units, the direct labor hours per unit is 1.5 hours, and the direct labor rate is $12.20 per hour.
Budgeted Direct Labor Cost = 220 * 1.5 * $12.20
Simplifying the equation:
Budgeted Direct Labor Cost = $4,026
Therefore, the budgeted direct labor cost for July at Zhang Industries is $4,026. This represents the expected cost of direct labor based on the production volume and labor rate for that month. It accounts for the labor hours required to produce the units and the corresponding cost per hour.
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What’s the answer guys I need it quick
Answer: its c obviously
Step-by-step explanation:
its easy
A solution of quinine fluoresces with an intensity of 3.7 units. When the concentration of quinine is increased by 4.0 mg/L it fluoresces with 6.5 units. (a) What is the concentration of quinine in mg/L
The concentration of quinine in mg/L can be determined by calculating the difference in fluorescence intensity and using the given information. In this case, the concentration of quinine is approximately 6.5 mg/L.
The relationship between the concentration of quinine and its fluorescence intensity can be described using a linear equation. By comparing the fluorescence intensities at two different concentrations, we can determine the concentration of quinine in mg/L.
The change in fluorescence intensity is given by:
ΔI = I2 - I1
In this case, ΔI = 6.5 units - 3.7 units = 2.8 units.
ΔI = mΔC
where m is the slope of the line, representing the change in intensity per unit change in concentration.
Rearranging the equation, we have:
m = ΔI / ΔC
Substituting the values, we get:
m = 2.8 units / 4.0 mg/L
m ≈ 0.7 units/mg/L
Now, we can find the concentration of quinine by rearranging the linear equation:
ΔC = ΔI / m
ΔC = 2.8 units / 0.7 units/mg/L
ΔC ≈ 4.0 mg/L
Therefore, the concentration of quinine in mg/L is approximately 6.5 mg/L.
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A taxi charges a flat rate of $2.25 plus an additional $0.50 per mile.
Annie has at most $10 to spend on the cab ride. Could Annie travel
18 miles?
Answer:
No, she can't
Step-by-step explanation:
The equation to solve the problem is the following:
y=0.5x+2.25
where x is the # of miles and y is the amount charged based on the flat rate and the additional $0.50 per mile (x).
y should be less than or equal to 10 since that's the maximum Annie can pay.
y[tex]\leq[/tex]10
Substitute x with the number of miles asked (18)
y = 0.5(18) + 2.25 = 11.25
Annie would have to spend $11.25 to travel 18 miles, but she can spend at most $10 ⇒ she can't travel 18 miles.
A politician selects a random sample of 306 voters from her state. For each voter, she records the region in which they live and their political affiliation. She would like to know if there is convincing evidence that the region in which voters live is associated with their political affiliation. Let = 0.05. The observed counts are displayed in the table.
Are the conditions for inference met?
No, the data do not come from a random sample.
No, the 10% condition is not met.
No, the Large Counts condition is not met since all expected counts are not greater than 5.
All conditions for inference are met.
Based on the hypothesis, the correct option is C. No, the Large Counts condition is not met since all expected counts are not greater than 5.
How to explain the informationThe statement mentions that the politician selects a random sample of 306 voters from her state. However, it also states that the data do not come from a random sample. This contradiction suggests that the random sample condition is not met.
The Large Counts condition for inference states that all expected counts must be greater than 5. In this case, the expected counts are:
Region 1: 103 * 0.4 = 41.2
Region 2: 103 * 0.3 = 30.9
Region 3: 103 * 0.3 = 31.9
As you can see, not all of these expected counts are greater than 5. Therefore, the Large Counts condition is not met and we cannot use the chi-square test for independence to test the politician's hypothesis.
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Find the volume
Please help quick!!!
Answer:
Step-by-step explanation:
Suppose that A is a subset of the reals. Select one: a. A is countably infinite b. A is uncountable c. A is finite d. Can't tell how big A is.
The correct answer is: d. Can't tell how big A is.
Based on the given information, can we determine the size of the subset A in the real numbers?
No, we cannot determine the size of subset A in the real numbers based on the given information. The size of A could be countably infinite, uncountable, finite, or we may not have enough information to determine its size.
To determine the size of subset A in the real numbers, we can consider the given options.
a. A is countably infinite:
This means that A can be put in a one-to-one correspondence with the set of natural numbers (counting numbers). In other words, A has the same cardinality as the set of natural numbers.
b. A is uncountable:
This means that A cannot be put in a one-to-one correspondence with the set of natural numbers. A set is uncountable if its cardinality is greater than that of the natural numbers.
c. A is finite:
This means that A contains a finite number of elements.
d. Can't tell how big A is:
This indicates that we do not have enough information to determine the size of A based on the given information.
Without any specific information about the subset A, we cannot determine its size.
Therefore, the correct answer is d. Can't tell how big A is.
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Suppose that a simple linear regression model has been fit, and the following information is available:
SSE = 552
n = 21
sx = 27.45
x with bar on top equal 9
A researcher wants to construct a 95% prediction interval for a new observation at the value x = 6. The fitted value at this point is
y with hat on top equal 29.82.
Find the upper bound of the prediction interval, to two decimal places.
The upper bound of the prediction interval is approximately 41.1.
How can the upper bound of a prediction interval be calculated?The upper bound of a prediction interval in a linear regression model can be calculated by adding the product of the critical value ([tex]\frac{t\alpha }{2}[/tex]) and the standard error (SE) to the fitted value (y). The critical value represents the desired level of confidence, such as 95%, and the standard error quantifies the variability of the model. By combining these components, the upper bound of the prediction interval provides a range within which a new observation is likely to fall, accounting for the uncertainty associated with the regression model.
To find the upper bound of the prediction interval, we can use the formula:
[tex]Upper Bound = y +(\frac{t\alpha }{2})* SE[/tex]
where y is the fitted value at x = 6, t[tex]\alpha[/tex]/2 is the critical value for a 95% confidence level (with degrees of freedom n - 2), and SE is the standard error.
Given information:
SSE = 552
n = 21
sx = 27.45
[tex]\bar x[/tex] = 9
y = 29.82
To calculate the standard error (SE) using the formula:
[tex]SE = \sqrt\frac{SSE}{ (n - 2)}[/tex]
[tex]SE = \sqrt\frac{552}{(21 - 2)}[/tex]
[tex]SE = \sqrt\frac{552}{ 19}[/tex]
SE ≈ 5.39
To find the critical value t[tex]\alpha[/tex]/2 for a 95% confidence level with degrees of freedom (n - 2). Since n = 21, degrees of freedom = 21 - 2 = 19.
Using statistical tables or a calculator, the tα/2 value for a 95% confidence level with 19 degrees of freedom is approximately 2.093.
Now, we can calculate the upper bound of the prediction interval:
[tex]Upper Bound = y + \frac{t\alpha }{2} * SE[/tex]
Upper Bound = 29.82 + (2.093 *5.39)
Calculating:
Upper Bound ≈ 29.82 + 11.28
Upper Bound ≈ 41.1
Therefore, the upper bound of the prediction interval, rounded to two decimal places, is approximately 41.1
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Write the linear equation in slope intercept form and simplify -2/5x + 2/5y = -2
Answer:
y = x - 2
Step-by-step explanation:
The slope-intercept form is y = mx + b
-2/5x + 2/5y = -2
2/5y = 2/5x - 2
y = x - 2
Answer:
y=x-5
Step-by-step explanation:
-2/5x+2/5y=-2
+2/5x +2/5x
2/5y=2/5x-2
*5/2 *5/2
10/10y=10/10x-10/2
y=x-5
When a piece of aluminum is placed in a 25 mL graduated cylinder that contains 10.0 mL of water, the water level rises to 13.5mL. What is the mass of the aluminum if the density is 2.69g/mL
The mass of the aluminum can be calculated using the change in volume and the density. the mass of the aluminum is approximately 9.415 grams.
The change in volume when the aluminum is added to the graduated cylinder is equal to the volume of the aluminum. The change in volume is obtained by subtracting the initial volume (10.0 mL) from the final volume (13.5 mL), resulting in 3.5 mL.
Since the density of aluminum is given as 2.69 g/mL, we can use this information to calculate the mass of the aluminum. The density of a substance is defined as the mass per unit volume. Therefore, we can multiply the density by the volume to obtain the mass.
Using the given density of 2.69 g/mL and the volume of 3.5 mL, the mass of the aluminum can be calculated as follows:
Mass = Density x Volume = 2.69 g/mL x 3.5 mL = 9.415 g
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Using first the customary ruler and then the metric
ruler, measure the length of the side of the wooden
block. remember to estimate to one place value
beyond the rulers' gradations.
1 3/32 in inches
y 2.78 cm centimeter
complete
calculate ratios for the number of centimeters in
an inch and the number of inches in a centimeter:
cm in or in/cm
1
hength
done
The number of centimeters in an inch is approximately 2.54, while the number of inches in a centimeter is approximately 0.39.
Using the customary ruler, the length of the side of the wooden block is measured as 1 3/32 inches.
This means the length is slightly over 1 inch but less than 1 1/8 inches.
To estimate one place value beyond the ruler's gradations, we can round the measurement to 1.1 inches.
Using the metric ruler, the length is measured as 2.78 centimeters. This measurement provides a more precise value in the metric system.
To calculate the ratio between centimeters and inches, we find that there are approximately 2.54 centimeters in an inch.
This means that for every 1 inch, there are approximately 2.54 centimeters.
Conversely, there are approximately 0.39 inches in a centimeter.
This means that for every 1 centimeter, there are approximately 0.39 inches.
In conclusion, the length of the wooden block's side is measured as 1.1 inches using the customary ruler and 2.78 centimeters using the metric ruler.
The conversion ratios between centimeters and inches are approximately 2.54 cm/inch and 0.39 inch/cm, respectively.
These ratios can be used to convert measurements between customary and metric systems.
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Jeff's roof is three times larger than Monica's roof. What is the measurement of the side where there is a question mark in the picture below? 24.9 ft. Jeff's Roof Monica's Roof OA) 8.1 ft OB) 8.3 ft OC) 8.7 ft OD) 12.5 ft
The value of the side in Monica's roof that is marked with a question mark would be = 8.3ft. That is option B.
How to determine the missing length of Monica's roof?To determine the missing length of Monica's roof the following steps should be taken as follows:
Jeff's roof = 3× Monica's roof
That is the dimensions of Monica's roof is three times Jeff's roof
Therefore, the missing length of Monica's roof = 24.9/3 = 8.3ft.
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Answer: The person above me is correct!
B) 8.3
Step-by-step explanation: 24.9 divided by 3 equals 8.3!
what is 14 + 54+56+65 divided by 2
Answer:
94.5
Step-by-step explanation:
14 + 54 + 56 + 65 = 189
189 ÷ 2 = 94.5
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Pls brainliest...
In time-series data, _____ are regularly repeating upward or downward movements in series values that can be tied to recurring events.
A) seasonal variations
B) seasonal relatives
C) naive variations
D) exponential relatives
The answer is: A) seasonal variations, Seasonal variations in time-series data refer to regularly repeating upward or downward movements tied to recurring events. hese patterns occur over fixed periods, such as daily, weekly, monthly, or yearly cycles.
Determine the seasonal variations?In time-series data, seasonal variations are regularly repeating upward or downward movements in series values that can be tied to recurring events.
These variations occur over a fixed period, such as daily, weekly, monthly, or yearly cycles. Seasonal variations can be observed in various phenomena, including sales data, weather patterns, and economic indicators.
By identifying and analyzing seasonal variations, patterns and trends can be detected, helping to make predictions and informed decisions.
Seasonal variations are commonly represented using seasonal indices or seasonal adjustment techniques to remove the effects of seasonality and better understand the underlying trends in the data.
Understanding and accounting for seasonal variations are crucial for accurate forecasting and decision-making in various fields.
Hence, the correct option is (A) seasonal variations.
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Find the standard form of the equation of the parabola with the given characteristic(s) and vertex at the origin.
Vertical axis and passes through the point (?3, ?3).
The standard form of the equation of the parabola with the given characteristic(s) and vertex at the origin is:
[tex]y=-\frac{1}{3}x^{2}[/tex]
What is the equation of the parabola with a vertex at the origin and a vertical axis, which passes through the point (-3, -3)?
The equation of the parabola in standard form is [tex]y=-\frac{1}{3}x^{2}[/tex]. This equation represents a parabola with a vertex at the origin (0, 0) and a vertical axis. Additionally, it passes through the point (-3, -3), satisfying the given characteristics.
To find the standard form of the equation of a parabola with a vertex at the origin and a vertical axis, we can use the general equation of a parabola:
y=[tex]a(x-h)^{2}[/tex]+k
where (h, k) = the vertex of the parabola.
Since the vertex is at the origin , the equation becomes:
y=a[tex]x^{2}[/tex]
Now, we need to find the value of 'a' using the given point on the parabola (-3, -3).
These values are satisfied the equation, we have:
[tex]-3=a(-3)^2[/tex]
Simplifying:
−3=9a
Dividing both sides by 9:
[tex]a=-\frac{1}{3}[/tex]
Therefore, the standard form of the equation of the parabola with the given characteristic(s) and vertex at the origin is:
[tex]y=-\frac{1}{3}x^{2}[/tex]
Hence, the equation in standard form is:[tex]y=-\frac{1}{3}x^{2}[/tex]
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you want to obtain a sample to estimate a population mean age of the incoming fall term transfer students. based on previous evidence, you believe the population standard deviation is approximately . you would like to be 99% confident that your estimate is within 2.3 of the true population mean. how large of a sample size is required?
We need an approximate sample size of n = 122 to estimate the population means the age of the incoming fall term transfer students, with a population standard deviation of 5.4, a margin of error of 2.3, and a confidence level of 99%. Therefore, the answer is 122.
The formula for calculating the sample size, given the population standard deviation, the desired level of confidence, and the margin of error, is as follows:
n = (zα/2)² * σ² / E²
Where, α is the significance level, zα/2 is the z-score at the α/2 percentile of the standard normal distribution, σ is the population standard deviation, E is the margin of error
To calculate the sample size required to estimate the population means age of the incoming fall term transfer students, with a population standard deviation of 5.4, a margin of error of 2.3, and a confidence level of 99%, we can substitute these values in the formula:n = (zα/2)² x σ² / E²
Where α = 0.01 (since we want a 99% confidence level, we need to subtract 1 from 100 and convert it to a decimal)
E = 2.3σ = 5.4
Using a z-table or a calculator, we can find the z-score at the 0.005 level of the standard normal distribution. The z-score is approximately 2.576.
n = (2.576)² * (5.4)² / (2.3)²
n ≈ 121.28
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A fountain is made up of two semicircles and a quarter circle. Find the perimeter of the fountain. Round your answer to the nearest tenth
The perimeter of the fountain is approximately 28.3 times the radius (r).
To find the perimeter of the fountain, we need to calculate the combined lengths of the two semicircles and the quarter circle.
Let's assume the radius of the semicircles is "r" and the radius of the quarter circle is "r/2" (since the quarter circle is half the size of the semicircle).
The perimeter of a semicircle is given by half the circumference of a full circle:
Perimeter of a semicircle = (1/2) × 2πr = πr
The perimeter of the quarter circle is given by one-fourth the circumference of a full circle:
Perimeter of a quarter circle = (1/4) × 2π(r/2) = (1/4) × πr = πr/4
Since we have two semicircles and one quarter circle, the total perimeter of the fountain is:
Total Perimeter = 2 × (Perimeter of a semicircle) + (Perimeter of a quarter circle)
Total Perimeter = 2πr + πr/4
Total Perimeter = (8πr + πr)/4
Total Perimeter = 9πr/4
Now, we need to round the answer to the nearest tenth. The value of π (pi) is approximately 3.14159. Therefore, we can substitute this value to get an approximate answer:
Total Perimeter ≈ 9 × 3.14159 × r/4
Total Perimeter ≈ 28.27431 × r
So, the perimeter of the fountain is approximately 28.3 times the radius (r).
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PLEASE HELP 30 points!!!!
One of the logos meets the building requirements. Which? EXPLAIN!!!!
The logo that fits the requirement is the triangle logo i.e. logo 2
Calculating the area and the width in meters?From the question, we have the following parameters that can be used in our computation:
The figures that represent the logos
For the triangle logo, we have
Area = 1/2 * 10 * 12
Convert units to meters using the scale
Area = 1/2 * (0.3 * 10) * (0.3 * 12)
Evaluate
Area = 5.4 sq meters
Also, we have
Width = 10 cm * 0.3
Width = 3.0 meters
For the logo 1, we have
Area = 2 * 8 * 3 + 6 * (12 - 2 * 3)
Convert units to meters using the scale
Area = 2 * 8 * 0.3 * 3 * 0.3 + 6 * 0.3 * (12 * 0.3 - 2 * 3 * 0.3)
Evaluate
Area = 7.56 sq meters
Also, we have
Width = 12 cm * 0.3
Width = 3.6 meters
Hence, the logo that fits the requirement is the triangle logo i.e. logo 2
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Work out the area of the circle below. Give your answer to 1 d.p. 16.9 cm
What are the rectangular coordinates for (4. 24, 135°)?
a. (-3, 3) c. (3, 3)
b. (3, -3) d. (-3, -3)
The rectangular coordinates for (4. 24, 135°) are (-3, 3). Hence, option a is correct.
To convert the given polar coordinates (4.24, 135°) to rectangular coordinates, we use the formulas,
x = r * cos(θ)
y = r * sin(θ)
Plugging in the values,
x = 4.24 * cos(135°)
y = 4.24 * sin(135°)
Evaluating the trigonometric functions for 135°,
x = 4.24 * (-0.7071) ≈ -3
y = 4.24 * 0.7071 ≈ 3
Therefore, the rectangular coordinates for (4.24, 135°) are approximately (-3, 3). So the answer is a. (-3, 3).
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2.9
10
Need step by step surface area
The area of the given triangle is 29 square unit.
For the given triangle
Half of altitude = 2.9
And one side = a = 10
Since we know that,
The height of a triangle is the perpendicular line segment traced from the triangle's vertex to the opposing side.
The height forms a right angle with the base of the triangle on which it rests. It is usually known as the height of a triangle and is represented by the letter 'h'.
It is calculated by measuring the distance between the vertex and its opposite side.
Therefore length of altitude be the height of triangle,
Then height = 2x2.9
= 5.8
Since we know that,
Area of triangle = (1/2)x 10 x 5.8
= 29 square unit.
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