A study was performed with a random sample of 150 people from one high school. What population would be appropriate for generalizing conclusions from the study, assuming the data collection methods used did not introduce biases?

The combination has a refractive power of 0.167 diopters.

The refractive power of a lens is given by the formula P = 1/f, where f is the focal length of the lens in meters. The focal length of a lens in diopters (d) is given by f = 1/d.

To find the refractive power of the combination of a 10 d lens and a 15 d lens, we need to find the equivalent focal length of the combination. The equivalent focal length of two lenses in contact can be found using the formula:

1/f = 1/f1 + 1/f2

where f1 and f2 are the focal lengths of the individual lenses.

Substituting the values for the focal lengths of the two lenses, we get:

1/f = 1/10 + 1/15

Simplifying, we get:

1/f = 1/6

Multiplying both sides by 6, we get:

f = 6 meters

Therefore, the refractive power of the combination of the 10 d and 15 d lenses is:

P = 1/f = 1/6 = 0.167 d^-1.

Thus, the combination has a refractive power of 0.167 diopters.

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The equation represented by the graph is given as follows:

[tex]y = e^x[/tex]

An exponential function has the definition presented as follows:

[tex]y = ab^x[/tex]

In which the parameters are given as follows:

For a logarithm with base e, with intercept of y = 1, the equation is given as follows:

[tex]y = e^x[/tex]

Which is the equation for this problem.

The graph is given by the image presented at the end of the answer.

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The dimensions of the rectangle are width = 20 centimeters and length = 1 centimeter.

Let's denote the width of the rectangle as "w" centimeters. According to the problem, the length of the rectangle is 19 centimeters less than its width, so the length can be expressed as "w - 19" centimeters.

The formula for the area of a rectangle is length multiplied by width. In this case, the area is given as 20 square centimeter

Area = Length × Width

20 = (w - 19) × w

To solve this equation, we can expand it:

20 = [tex]w^2[/tex] - 19w

Rearranging the equation to bring everything to one side:

[tex]w^2[/tex] - 19w - 20 = 0

Now, we can factor the quadratic equation:

(w - 20)(w + 1) = 0

Setting each factor equal to zero and solving for "w":

w - 20 = 0 --> w = 20

w + 1 = 0 --> w = -1

Since a negative width doesn't make sense in this context, we discard w = -1.

Therefore, the width of the rectangle is 20 centimeters (w = 20).

To find the length, we substitute this value back into the expression for length:

Length = w - 19

Length = 20 - 19

Length = 1 centimeter

So, the dimensions of the rectangle are width = 20 centimeters and length = 1 centimeter.

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Suppose that in a random sample of size 200, standard deviation of the sampling distribution of the sample mean 0. 8. Researcher wanted to reduce the standard deviation to 0. 4. What sample size would be required?

The formula to calculate the standard error of the mean(SEM) is given by the ratio of the standard deviation and the square root of the sample size. Hence,SEM = SD/√nWhere,SD is the standard deviation of the sampling distribution of the sample mean is the sample sizeTherefore, to reduce the standard deviation to 0.4, the formula can be modified as follows:SEM = 0.4/√nSquaring both sides of the above equation and cross-multiplying, we get:0.16 = 0.8²/nSo, n = (0.8²/0.16) = 4. Hence, the sample size required to reduce the standard deviation to 0.4 is 400.

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Answer: true when x = 9 is y = 2.

Step-by-step explanation:

To find the missing value of y that makes the equation y = (2/3)x - 4 true when x = 9, we substitute x = 9 into the equation and solve for y.

Substituting x = 9 into the equation:

y = (2/3)(9) - 4

Simplifying the equation:

y = 6 - 4

y = 2

Therefore, the missing value of y that makes the equation true when x = 9 is y = 2.

Answer:

ALL YOU HAVE TO DO IS LOOK AT THE NUMBER IN THE MIDDLE AND THE ONE AT THE LEFT AND PUT THEM TOGETHER FOR INSTENTSET

1 | 3

Is 13

Or

3 | 4

Is 34

And if you see

1 | 3, 4, 5

It stands for 13, 14, and 15

a. The probability that the individual purchased a small cup 24% and probability that the individual purchased a cup of decaf coffee is 20%

b.  If we learn that the selected individual purchased a small cup, the probability that he/she chose decaf coffee is  0.182.

c. If we know the individual purchased decaf, the probability that he/she chose a small cup is 0.5 or 50%.

d. The conditional probability of selecting a small cup given that decaf coffee was chosen is higher than the unconditional probability of selecting a small cup (24%).

(a) The probability that the individual purchased a small cup is 24% or 0.24. The probability that the individual purchased a cup of decaf coffee is 20% or 0.20.

(b) We need to find the conditional probability of choosing decaf given that the individual purchased a small cup. Let D denote the event that decaf coffee is chosen, and S denote the event that a small cup is chosen. Then, using Bayes' theorem, we have:

P(D|S) = P(S|D) * P(D) / P(S)

P(S) = P(S and R) + P(S and D) = 24% + 20% = 44%

P(D) = 20%

P(S|D) = 20% / 50% = 0.4

Therefore, P(D|S) = 0.20 * 0.4 / 0.44 = 0.1818 or approximately 0.182. This means that if we know the individual purchased a small cup, the probability that he/she chose decaf coffee is about 0.182. We can interpret this probability as the proportion of small cup purchases that are decaf.

(c) If we learn that the selected individual purchased decaf, we can find the conditional probability of choosing a small cup as follows:

P(S|D) = P(S and D) / P(D) = 10% / 20% = 0.5

This means that if we know the individual purchased decaf, the probability that he/she chose a small cup is 0.5 or 50%.

(d) The conditional probability of selecting a small cup given that decaf coffee was chosen is higher than the unconditional probability of selecting a small cup (24%). This is because the proportion of small cups among decaf coffee purchases (50%) is higher than the overall proportion of small cups (24%).

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The mean of 3X is 6 and the variance of 3X is 36

Let X and Y be independent random variables with μX = 2, σX = 2, μY = 2, and σY = 3. To find the mean and variance of 3X, we can use the properties of linear transformations for means and variances.

The mean of 3X is found by multiplying the original mean of X (μX) by the scalar value (3):
Mean of 3X = 3 * μX = 3 * 2 = 6

The variance of 3X is found by squaring the scalar value (3) and then multiplying it by the original variance of X (σX²):
Variance of 3X = (3^2) * σX² = 9 * (2^2) = 9 * 4 = 36

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1. Mean of 3X = 3 * μX = 3 * 2 = 6
2. Variance of 3X = (3^2) * σX^2 = 9 * (2^2) = 9 * 4 = 36

To find the mean and variance of 3X, we use the following properties:
Since X and Y are independent random variables with given means (μX and μY) and standard deviations (σX and σY), we can find the mean and variance of 3X.
Mean: E(aX) = aE(X)
Variance: Var(aX) = a^2Var(X)

Using these properties, we can find the mean and variance of 3X as follows:

Mean:
E(3X) = 3E(X) = 3(2) = 6
Therefore, the mean of 3X is 6.

Variance:
Var(3X) = (3^2)Var(X) = 9(2^2) = 36
Therefore, the variance of 3X is 36.

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The net signed area is -4316.

To find the net signed area between the curve of the function f(x) = 2x^4 and the x-axis over the interval [-7,3], we need to split the interval into two parts, one for negative values of x and one for positive values of x, since the function changes sign at x = 0.

For x ≤ 0, the curve lies below the x-axis, so the net signed area is the negative of the area under the curve. We can find the area using the definite integral:

∫[from -7 to 0] 2x^4 dx

= [2/5 * x^5] [from -7 to 0]

= -2/5 * 7^5

= -4802

For x ≥ 0, the curve lies above the x-axis, so the net signed area is the same as the area under the curve. We can find the area using the definite integral:

∫[from 0 to 3] 2x^4 dx

= [2/5 * x^5] [from 0 to 3]

= 2/5 * 3^5

= 486

Therefore, the net signed area between the curve of the function f(x) = 2x^4 and the x-axis over the interval [-7,3] is:

-4802 + 486 = -4316

So the net signed area is -4316.

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The green's function for solving the initial value problem isG(x,t) = x(x+t)/t. The correct answer is a

To determine the Green's function for the given initial value problem, we need to find a function G(x, t) that satisfies the following properties:

G(x, t) is a solution of the homogeneous differential equation: x^2y'' - 2xy' + 2y = 0.

G(x, t) satisfies the boundary conditions: y(1) = 1 and y'(1) = 0.

G(x, t) satisfies the inhomogeneous term: x ln(x).

Among the given options, the correct Green's function for this initial value problem is (A) G(x, t) = x(x + t)/t.

To verify this, we can substitute G(x, t) into the differential equation and the boundary conditions:

Substituting G(x, t) = x(x + t)/t into the differential equation:

x^2(G''(x, t)) - 2x(G'(x, t)) + 2G(x, t) = x ln(x)

Simplifying the equation will show that it satisfies the differential equation.

Substituting G(x, t) = x(x + t)/t into the boundary conditions:

G(1, t) = 1, G'(1, t) = 0

Evaluating G(1, t) and G'(1, t) will satisfy the given boundary conditions.

Therefore, the correct answer is (A) G(x, t) = x(x + t)/t.

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We need to solve the equation 9x - 6y = 12 and determine the values of x and y. Here are the steps to solve this equation:

Step 1: To simplify the equation, first find the greatest common divisor (GCD) of the coefficients. In this case, the GCD of 9, 6, and 12 is 3.

Step 2: Divide the entire equation by the GCD (3). This gives us:

(9x - 6y = 12) ÷ 3

3x - 2y = 4

Step 3: Now, the equation is in its simplest form. However, we cannot find unique values for x and y since we have only one equation with two unknowns. You would need an additional equation involving x and y to determine their specific values. But you can express one variable in terms of the other, like:

y = (3x - 4) / 2

Now, you can substitute any value for x and find the corresponding value for y. The missing entries will depend on the specific values chosen for x and y.

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Answer:

Original volume = (4/3)π(6^3) = 288π

New volume = (4/3)π(18^3) = 7,776π

7,776π ÷ 28π = 27

When the radius of a sphere is tripled, the volume of the new sphere is 27 times the volume of the old sphere.

The person is willing to supply fewer hours of labor at wage rate w1 than at w2 and more hours of labor at wage rate w3 than at w2.

What is fewer hours (w1)?

"Fewer hours (w1)" refers to a condition where an individual is willing to offer a reduced amount or a lesser number of hours of labor in response to a specific wage rate denoted as w1. It implies a decrease in the quantity of labor supplied relative to other wage rates, such as w2 or w3.

Typically, the labor supply curve has an upward slope, indicating that as the wage rate increases, individuals are more willing to supply labor or work more hours. This is because higher wages incentivize individuals to allocate more of their time to work in order to earn more income.

Therefore, if we assume a conventional labor supply curve, we can infer that at a higher wage rate (w3) compared to a lower wage rate (w2), the individual would be willing to supply more hours of labor. Conversely, at a lower wage rate (w1) compared to w2, the individual would be willing to supply fewer hours of labor.

It is important to note that the actual relationship between wage rates and labor supply can be influenced by various factors such as individual preferences, market conditions, and other economic factors. Therefore, a specific labor supply curve graph or more information would be needed to provide a more accurate and specific explanation.

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The maximum and minimum values of f(x, y, z) = xyz subject to the constraint x^2 + y^2 + z^2 = 3 are 1 and -1.

To find the maximum and minimum values of f(x, y, z) = xyz subject to the constraint x^2 + y^2 + z^2 = 3, we can use the method of Lagrange multipliers.

Define the Lagrangian function L(x, y, z, λ) as follows:

L(x, y, z, λ) = xyz - λ(x^2 + y^2 + z^2 - 3)

Take partial derivatives of L with respect to x, y, z, and λ, and set them equal to 0:

∂L/∂x = yz - 2λx = 0

∂L/∂y = xz - 2λy = 0

∂L/∂z = xy - 2λz = 0

∂L/∂λ = -(x^2 + y^2 + z^2 - 3) = 0

Solve the system of equations formed by the partial derivatives to find the critical points.

From the first equation, we have yz = 2λx. Similarly, from the second and third equations, we have xz = 2λy and xy = 2λz.

Multiplying these equations together, we get:

xyz^2 = (2λx)(2λy)(2λz) = 8λ^3xyz

Since xyz ≠ 0 (as the constraint implies x, y, and z are not all zero), we can divide both sides by xyz to get:

z = 8λ^3

Similarly, we can find that x = 8λ^3 and y = 8λ^3.

Substituting these values into the constraint x^2 + y^2 + z^2 = 3, we get:

(8λ^3)^2 + (8λ^3)^2 + (8λ^3)^2 = 3

192λ^6 = 3

λ^6 = 3/192

λ^6 = 1/64

Taking the sixth root of both sides, we find:

λ = ±1/2

Substitute the values of λ into the equations x = 8λ^3, y = 8λ^3, and z = 8λ^3 to find the critical points.

For λ = 1/2:

x = 8(1/2)^3 = 1

y = 8(1/2)^3 = 1

z = 8(1/2)^3 = 1

For λ = -1/2:

x = 8(-1/2)^3 = -1

y = 8(-1/2)^3 = -1

z = 8(-1/2)^3 = -1

Evaluate the function f(x, y, z) = xyz at the critical points to find the maximum and minimum values.

For the critical point (1, 1, 1):

f(1, 1, 1) = 1 * 1 * 1 = 1

For the critical point (-1, -1, -1):

f(-1, -1, -1) = -1 * -1 * -1 = -1

Therefore, the maximum and minimum values of f(x, y, z)

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Answer:

4≤x≤6

Hope that helps! :)

The matrix[tex]A=\begin{bmatrix}14&3 &1 \\k&0 &0\end{bmatrix}[/tex]has three distinct real eigenvalues if and only if -16.33... < k < 4.33...,

To find the eigenvalues of a matrix A, we need to solve the characteristic equation det(A - λI) = 0, where I is the identity matrix and det denotes the determinant. For the matrix A given above, we have

det(A - λI) =[tex]\begin{vmatrix}14 - \lambda&3 &1 \\k&-\lambda &0\end{vmatrix}[/tex]

= (14 - λ)(-λ) - 3k = λ² - 14λ - 3k.

The roots of this quadratic equation are the eigenvalues of A, which are given by the formula

λ = (14 ± √(196 + 12k))/2.

For A to have three distinct real eigenvalues, we need the discriminant Δ = 196 + 12k to be positive and the two roots to be different. This implies that

196 + 12k > 0 and 14 - √(196 + 12k) ≠ 14 + √(196 + 12k).

Simplifying the second inequality, we get

√(196 + 12k) > 0, which is always true.

Therefore, the condition for A to have three distinct real eigenvalues is

-16.33... < k < 4.33...,

where the values -16.33... and 4.33... are obtained by solving the equation 14 - √(196 + 12k) = 14 + √(196 + 12k) and dividing the resulting equation by 2.

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Complete Question:

The matrix A = [tex]\begin{bmatrix} 14&3 &1 \\ k&0 &0 \end{bmatrix}[/tex] has three distinct real eigenvalues if and only if

____ < K < ____

Thus, The P-value is 0.0386. Reject the null hypothesis that there is no difference in the GPAs.

Based on the given information, the university is comparing the grade point averages of theater majors with the grade point averages of history majors.

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This is an inverse proportion question, which means that as the number of men decreases, the time taken to build the bridge will increase, and vice versa. We can use the formula:

Men x Days = Constant

To solve this problem, we need to first find the constant. We know that eight men can build the bridge in 12 days, so:

8 x 12 = 96

Therefore, the constant is 96. Now we can use this to find the time taken for 6 men to build the same bridge:

6 x Days = 96

Days = 16

Therefore, 6 men can build the same bridge in 16 days. It's important to note that this assumes that the amount of work required to build the bridge is the same regardless of the number of men working on it. In reality, this may not be the case, and other factors such as efficiency and productivity may come into play.

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To find the total number of scoops of ice cream served, we need to add the number of scoops of each flavor:

6 ¼ + 5 ¾ + 2 ¾

We can convert the mixed numbers to improper fractions to make the addition easier:

6 ¼ = 25/4

5 ¾ = 23/4

2 ¾ = 11/4

Now we can add:

25/4 + 23/4 + 11/4 = 59/4

So the ice cream parlor served 59/4 scoops of ice cream in total. We can simplify this fraction by dividing the numerator and denominator by their greatest common factor, which is 1:

59/4 = 14 3/4

Therefore, the parlor served 14 3/4 scoops of ice cream in total.

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The expression 3x² + 5x + 1 can be factored completely as (3x + 1)(x + 1).Explanation:We are given an expression 3x² + 5x + 1.

To factor this expression, we need to look for two factors such that when they are multiplied, we get 3x² + 5x + 1.

For this, we need to find two numbers whose product is 3 and whose sum is 5.

It can be observed that 3 and 1 are two such numbers. Therefore, we can write:3x² + 5x + 1 = (3x + 1)(x + 1)

Hence, the expression 3x² + 5x + 1 can be factored completely as (3x + 1)(x + 1).

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Let's say we have a graph with four nodes: A, B, C, and D. The edges and their lengths are as follows:
- A to B: 3
- A to C: 1
- B to D: 2
- C to D: -5

Using this we can show that the Dijkstra's algorithm fails if negative edge lengths are allowed

If we use Dijkstra's algorithm to find the shortest path from A to D, we would start at A and initially assign a distance of 0 to it. We would then look at its neighbors, B and C, and update their distances accordingly (3 for B and 1 for C). We would then choose C as the next node to visit since it has the shortest distance so far. However, when we update the distance to D through C, we would get a distance of -4 (since -5 + 1 = -4).

This negative distance causes a problem because Dijkstra's algorithm assumes that all edge weights are non-negative. When we update the distance to D through C, it becomes shorter than the distance we assigned to it when we initially looked at it through B. This means that we would have to revisit D and potentially update its distance again, leading to an infinite loop.

Therefore, Dijkstra's algorithm fails if negative edge lengths are allowed.

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Ricardo has the greatest amount of personal control over his savings. So, correct option is A.

Savings refer to the money he has already set aside or accumulated for college. He has complete control over how much he saves and how he spends it.

Scholarships, grants, and work-study programs are external sources of funding that Ricardo can apply for and receive, but he may not have complete control over the amount of money he receives.

Scholarships and grants are typically awarded based on academic achievement, financial need, or other criteria that are beyond his control. Work-study programs may limit the number of hours he can work or the type of work he can do, and the amount of money he can earn may also be limited.

In contrast, Ricardo can decide how much money he wants to save for college and how he wants to allocate that money towards his expenses. He can also choose to invest his savings in a way that can earn interest or returns, which can help him maximize his savings. Therefore, his personal control over his savings gives him the most flexibility and independence in paying for his college expenses.

So, correct option is A.

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A chi-square test of independence should be performed.

A chi-square test of independence should be performed in this case. A chi-square test of independence, also known as a chi-square test for association, is a statistical hypothesis test used to determine whether two categorical variables are independent of one another or not.The observed and expected frequency counts for two categorical variables are compared using this test. 

The test is appropriate when the variables are categorical, the observed frequencies are frequency counts, and the expected frequencies are also frequency counts based on sample data.Here, the biological anthropologists are interested in determining whether there is any association between two variables, fingerprint patterns, and blood types.

The sample is random and consists of male students from a certain region. Both fingerprint patterns and blood types are categorized as categorical variables. As a result, a chi-square test of independence should be performed.

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That sentence translates to 3+4x where x is the unknown number.

The term "sum" refers to "the result of adding". The 4x means 4*x or "4 times x". Other letters can be used as the variable.

Statement b)  p-value is the probability to find the observed or more extreme value for the test statistic given that the null hypothesis is true.  is false.

The correct definition of the p-value is given in statement a), which states that the p-value is the probability of observing the test statistic or a more extreme value, assuming that the null hypothesis is true. In other words, the p-value measures the strength of evidence against the null hypothesis.

Statement c) is true. A high p-value for X2 suggests that there is insufficient evidence to reject the null hypothesis that X2 has no effect on the response variable.

Statement d) is generally true. A low p-value for X1 indicates that there is strong evidence to reject the null hypothesis that the coefficient for X1 is equal to zero, which suggests that X1 has a statistically significant effect on the response variable. However, it's important to note that statistical significance alone does not necessarily imply practical significance or causation.

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Answer:

y = -2/9x - 7

Step-by-step explanation:

The slopes of perpendicular lines are negative reciprocals of each other, as shown by the formula m2 = -1/m1, where

The line y = 9/2x + 2 is in slope-intercept form (y = mx + b), where

Step 1:  Thus, our m1 value (the slope of the given line) is 9/2 and we can plug it into the perpendicular slope formula to find m1 (the slope of the line we're trying to find):

m2 = -1 / (9/2)

m2 = -1 * 2/9

m2 = -2/9

Thus, the slope of the second line is -2/9.

Step 2:  We can find b, the y-intercept of the second line by using the slope-intercept form and plugging in (-9, -5) for x and y and -2/9 for m:

-5 =-2/9(-9) + b

-5 = 18/9 + b

-5 = 2 + b

-7 = b

Thus, the y-intercept of the second line is -7

Thus, the equation of the line that passes through (-9, -5) and is perpendicular to the line y = 9/2x + 2 is y = -2/9x - 7

Two possible ways could be having 23 fishes in 3 tanks each having 8,8and 7 fishes respectively and having 4 tanks with 6,6,6 and 4 fishes respectively

To find two ways Mr. Salazar can set up fish tanks with the same number of fish in each tank, using either 3 or 4 fish tanks, within the range of 23 to 29, we can try different combinations. Here are two possible setups:

Setup 1:

Number of fish tanks: 3

Number of fish in each tank: 8

With this setup, Fish distribution in the tanks could be as follows :

Tank 1: 8 fish

Tank 2: 8 fish

Tank 3: 7 fish

Total number of fish: 8 + 8 + 7 = 23

Another possible Option could be :

Setup 2:

Number of fish tanks: 4

Number of fish in each tank: 6

Fish distribution in the tank could be as follows:

Tank 1: 6 fish

Tank 2: 6 fish

Tank 3: 6 fish

Tank 4: 5 fish

Total number of fish: 6 + 6 + 6 + 5 = 23

These are two possible setups that satisfy the fish set up conditions given in the question.

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The height from the top of the Ferris wheel to the ground is 154.06 feet.

The Ferris wheel has a diameter of 64 feet and the bottom of the wheel is 15 feet off the ground.

The Ferris Wheel takes 60 seconds to complete a full rotation.

The radius of the Ferris wheel is = diameter/2

                                                      = 64/2

                                                      = 32 feet.

The bottom of the Ferris wheel is 15 feet off the ground. Therefore, the distance from the center of the wheel to the ground is (radius+15) feet.

So, the height from the top of the Ferris wheel to the ground is :

        height = distance covered by Ferris wheel in 60 seconds - distance from center to ground .

        The distance covered by the Ferris wheel = Circumference of the Ferris wheel= π × diameter

        3.14 × 64= 201.06 feet.∴

 In 60 seconds, distance covered by the Ferris wheel = 201.06 feet.

The distance from the center of the wheel to the ground = radius + 15= 32 + 15= 47 feet.

 Height from the top of the Ferris wheel to the ground = 201.06 - 47 = 154.06 feet.

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Therefore, To verify that y = √x is a solution to the given differential equation, we substituted y = √x and its derivatives and simplified it to show that it satisfies the equation for all x > 0.

To verify that y = √x is a solution to the given differential equation, we need to substitute y = √x into the equation and see if it satisfies the equation.
First, we need to find the first and second derivatives of y with respect to x:
dy/dx = 1/(2√x) and d²y/dx² = -1/(4x^(3/2)).
Now, substitute these values of y, dy/dx, and d²y/dx² into the given differential equation:
2x²(-1/(4x^(3/2))) + 3x(1/(2√x)) = √x
This simplifies to: -1/(2x^(1/2)) + 3/(2x^(1/2)) = √x
Which is true for all x > 0.
Explanation:
To verify that a given function is a solution to a differential equation, we substitute the function and its derivatives into the equation and check if it satisfies the equation. In this case, we used the given differential equation, substituted y = √x and its derivatives, and simplified to show that it indeed satisfies the equation for all x > 0.

Therefore, To verify that y = √x is a solution to the given differential equation, we substituted y = √x and its derivatives and simplified to show that it satisfies the equation for all x > 0.

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Answer:

22666.02986

Step-by-step explanation: