find the area of the region that is bounded by the curve r=2sin(θ)−−−−−−√ and lies in the sector 0≤θ≤π.

Answer:

4/5

Step-by-step explanation:

The sin of B is equal to opposite/hypotenuse

So, the equation would be 4/5 because 4 is equal to the opposite side length of B and 5 is equal to the hypotenuse of the triangle.

So, the answer would be 4/5

The 98% confidence interval for the true mean of exam 2 is approximately (62.81, 81.75).

To construct a 98% confidence interval for the true mean of exam 2, we will use the provided information:

Mean (μ) = 72.28
Standard deviation (σ) = 18.375
Sample size (n) = 25

First, we need to find the standard error of the mean (SE):
SE = σ / √n = 18.375 / √25 = 18.375 / 5 = 3.675

Next, we need to find the critical value (z) for a 98% confidence interval. The critical value for a 98% confidence interval is 2.576 (from the z-table).

Now we can calculate the margin of error (ME):
ME = z × SE = 2.576 × 3.675 ≈ 9.47

Finally, we can calculate the confidence interval:
Lower limit = μ - ME = 72.28 - 9.47 ≈ 62.81
Upper limit = μ + ME = 72.28 + 9.47 ≈ 81.75

So, the 98% confidence interval for the true mean of exam 2 is approximately (62.81, 81.75).

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Answer: D. The two rotations map the same image since 350° is a full rotation and 180° + 360° = 540°.

The value of C in the equation is C = (D - F)/(A - B).

We have,

We need to isolate the variable C on one side of the equation, which we can do by moving all the other terms to the other side:

So,

AC + F = BC + D

Subtract BC from both sides:

AC - BC + F = D

Factor out C on the left-hand side:

C(A - B) + F = D

Subtract F from both sides:

C(A - B) = D - F

Divide both sides by (A - B):

C = (D - F)/(A - B)

Therefore,

The value of C in the equation is C = (D - F)/(A - B)

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The angle ACB is tan⁻¹(80/a), the range of tan⁻¹(x) is (0, 90) and the time taken to reach the shore is a/30

The measure of ACB can be calculated using the following tangent trigonometry ratio

tan(ACB) = Opposite/Adjacent

So, we have

tan(β) = 80/a

Take the arc tan of both sides

So, we have

β = tan⁻¹(80/a)

So, the angle is tan⁻¹(80/a)

Given that the angle is an acute angle

The range of tan⁻¹(x) for acute angles can be found by considering the values of the tangent function for angles between 0 and 90 degrees.

Since tan(0) = 0 and tan(90) is undefined, the tangent function takes on all positive values in this range.

So, the range of tan⁻¹(x) for acute angles is (0, 90) degrees.

Here, we have

Distance = a

Speed = 30 km/h

The time taken to reach the shore can be calculated using the formula:

time = distance / speed

Substituting the given values, we get:

time = a / 30 km/h

Simplifying this expression, we get:

time = a / 30 hours

Therefore, the time taken to reach the shore is a/30 hours, where a is the distance to the shore in kilometers.

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We used the fact that y goes to 1 as x goes to infinity to determine the value of the constant C in the equation we got from part B. This allowed us to find the equation for the curve.

C) To find the equation for the curve given the condition that as x goes to infinity, y goes to 1, we need to use the solution obtained in part B and determine the constant C. Here's how to do it:

As x approaches infinity, we have:
1 = sqrt((x^4 + 8x^2 + 16) / (2x)) + C

Since x is going to infinity, we can consider x^4 to be dominant over the other terms in the numerator, so:
1 ≈ sqrt((x^4) / (2x)) + C

Simplifying the above expression, we get:
1 ≈ sqrt(x^3 / 2) + C

As x goes to infinity, the term sqrt(x^3 / 2) also goes to infinity. For the equation to hold true, C must be equal to negative infinity. However, since C is a constant and not a variable, we cannot consider it to be equal to negative infinity.

Thus, there seems to be a mistake in the solution obtained in part B, as it does not satisfy the given condition in part C. Please double-check the solution and steps taken in part B to ensure the correctness of the answer.

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Answer:If Chloe rolls the number cube twice and flips the coin once, there are 2 possible outcomes for the coin flip (heads or tails) and 6 possible outcomes for each roll of the number cube.

To find the total number of possible outcomes, we can use the multiplication principle of counting. The total number of possible outcomes is given by the product of the number of outcomes for each event.

Therefore, the total number of possible outcomes is:

2 x 6 x 6 = 72

So, there are 72 possible outcomes when Chloe rolls the number cube twice and flips the coin once.

Step-by-step explanation:

Answer:

(a) Yes, the statement is true. If the null hypothesi is true, we can retain the null. 

(b) Yes, the statement is true

Answer:

(a) Yes, the statement is true. If the null hypothesi is true, we can retain the null. 

(b) Yes, the statement is true

The Partial F test is used to compare two nested linear regression models, where Model B is a more complex version of Model A. The null hypothesis of the test is that the additional variables in Model B do not have a significant impact on the dependent variable, while the alternative hypothesis is that they do.

To compute the Partial F test statistic, we need to first fit both models and obtain their respective residual sum of squares (RSS). Then, we can use the formula:

F = (RSS_A - RSS_B) / (p - q) * (RSS_B / (n - p))

where p is the number of variables in Model A (excluding the intercept), q is the number of additional variables in Model B (excluding those already in Model A), and n is the sample size.

The resulting F value follows an F-distribution with (q, n - p) degrees of freedom. We can then calculate the p-value by comparing this F value to the critical value of the F-distribution with the same degrees of freedom, using a significance level of 0.05.

If the p-value is less than 0.05, we reject the null hypothesis and conclude that Model B is a better fit than Model A. Otherwise, we fail to reject the null hypothesis and conclude that there is no significant difference between the two models.

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Note that the use of the term "implicitly" in the question suggests that there is some other equation or context that defines y, but without that information, we can only assume that y is an arbitrary function. To differentiate 4/9 with respect to an implicitly defined function, we first need to clarify what that function is.

Let's call it y, so we have: 4/9 = f(y)
Now, we can differentiate both sides with respect to y using the chain rule: d/dy (4/9) = d/dy (f(y))
0 = f'(y)
So, the derivative of 4/9 with respect to an implicitly defined function y is 0. We can write this as:
d/dy (4/9) = 0
Note that the use of the term "implicitly" in the question suggests that there is some other equation or context that defines y, but without that information, we can only assume that y is an arbitrary function.

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The temperature of the soup after 5 minutes is [tex]26 + 42.5(e^4 - 1)[/tex]degrees Celsius.

1. The given expression represents the accumulation function of the population of the beachside resort. It is the integral of the rate function r(t) over the time interval [2, t], where t is the current time in years. The value of the integral at t is added to the initial population of 4823 to get the current population. In other words, the expression represents the total number of residents that have moved into the resort from time 2 to time t.

So, the expression can be written as: [tex]4823 + \int 2t r(x) dx = 7635 + \int 2t r(x) dx[/tex]

2. To find how much the temperature increased between t = 0 and t = 10 minutes, we need to evaluate the integral of the rate function r(t) over the time interval [0, 10]. The value of the integral will give us the total increase in temperature during this time period.

So, the expression can be written as[tex]\int 0^{10} 34e^{0.8t} dt[/tex]

Simplifying the integral, we get[tex]: [42.5e^{0.8t}]0^{10} = 42.5(e^8 - 1)[/tex] degrees Celsius

Therefore, the temperature of the soup increased by[tex]42.5(e^8 - 1)[/tex]degrees Celsius between t = 0 and t = 10 minutes.

3. To find the temperature of the soup after 5 minutes, we need to evaluate the expression for the accumulation function of temperature at t = 5, given that the initial temperature is 26 degrees Celsius.

So, the expression can be written as:[tex]26 + \int 0^5 34e^{0.8t} dt[/tex]

Simplifying the integral, we get: [tex]26 + [42.5e^{0.8t}]0^5 = 26 + 42.5(e^4 - 1)[/tex] degrees Celsius

Therefore, the temperature of the soup after 5 minutes is[tex]26 + 42.5(e^4 - 1)[/tex]degrees Celsius.

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an+1 ≤ √(2(n+1)) + 1/2.

Since we have shown

To show that an = floor(√(2n) + 1/2), we need to prove two things:

an ≤ √(2n) + 1/2

an + 1 > √(2(n+1)) + 1/2

We will prove these statements by induction.

Base case: n = 1

a1 = 1 = floor(√(2*1) + 1/2) = floor(1.5)

The base case holds.

Induction hypothesis:

Assume that an = floor(√(2n) + 1/2) for some positive integer n.

Inductive step:

We need to show that an+1 = floor(√(2(n+1)) + 1/2) based on the induction hypothesis.

By definition of the sequence, a1 through an represent the first 1+2+...+n = n(n+1)/2 terms. Therefore, an+1 is the (n+1)th term.

The (n+1)th term is k if and only if 1+2+...+k-1 < n+1 ≤ 1+2+...+k.

Using the formula for the sum of the first k integers, we can simplify this condition to:

k(k-1)/2 < n+1 ≤ k(k+1)/2.

Multiplying both sides by 2 and rearranging, we get:

k^2 - k < 2n+2 ≤ k^2 + k.

Adding 1/4 to both sides, we get:

k^2 - k + 1/4 < 2n+2 + 1/4 ≤ k^2 + k + 1/4.

Taking the square root, we get:

k - 1/2 < √(2n+2) + 1/2 ≤ k + 1/2.

Now, we want to show that an+1 = k = floor(√(2(n+1)) + 1/2).

First, we will show that an+1 > √(2(n+1)) - 1/2.

Assume, for the sake of contradiction, that an+1 ≤ √(2(n+1)) - 1/2. Then:

k ≤ √(2(n+1)) - 1/2

k + 1/2 ≤ √(2(n+1))

(k + 1/2)^2 ≤ 2(n+1)

k^2 + k + 1/4 ≤ 2n + 2

This contradicts the fact that k is the smallest integer satisfying k^2 - k < 2n+2.

Therefore, an+1 > √(2(n+1)) - 1/2.

Next, we will show that an+1 ≤ √(2(n+1)) + 1/2.

Assume, for the sake of contradiction, that an+1 > √(2(n+1)) + 1/2. Then:

k > √(2(n+1)) + 1/2

k - 1/2 > √(2(n+1))

(k - 1/2)^2 > 2(n+1)

k^2 - k + 1/4 > 2n + 2

This contradicts the fact that k is the smallest integer satisfying 2n+2 ≤ k(k+1)/2.

Therefore, an+1 ≤ √(2(n+1)) + 1/2.

Since we have shown

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The assertion "H: > 125" can be part of a legitimate statistical hypothesis when accompanied by a corresponding null hypothesis.

We will determine if the assertion "H: > 125" is a legitimate statistical hypothesis and explain why.

A statistical hypothesis is a statement about a population parameter that can be tested using sample data. There are two types of hypotheses: null hypothesis (H0) and alternative hypothesis (H1 or Ha). The null hypothesis is a statement of no effect, while the alternative hypothesis is a statement of an effect or difference.

In this case, the assertion "H: > 125" appears to be an alternative hypothesis, as it suggests that some parameter is greater than 125. However, for it to be a legitimate statistical hypothesis, it must be paired with an appropriate null hypothesis.

For example, if we were testing the mean weight of a certain species of animal, our hypotheses could be as follows:

- Null hypothesis (H0): The mean weight is equal to 125 (μ = 125)
- Alternative hypothesis (H1): The mean weight is greater than 125 (μ > 125)

With this pair of hypotheses, we can conduct a statistical test to determine whether the data supports the alternative hypothesis or not. In conclusion, the assertion "H: > 125" can be part of a legitimate statistical hypothesis when accompanied by a corresponding null hypothesis.

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In the circle on the left bottom, 4

the circle on the right bottom, 5

the square on the right, -15

18, 21, 24, 27, 30 can be gotten when 6, 7, 8, 9, 10 are multiplied three times.

Sequence is  an ordered list of numbers that often follow a specific pattern or rule. Sequence is a list of things that are in order.

How to determine this

6, 7, 8, 9, 10 are related to 18, 21, 24, 27, 30

6 * 3 = 18

7 * 3 = 21

8 * 3 = 24

9 * 3 = 27

10 * 3 = 30

All of them followed the same sequence of being multiplied by 3.

6, 7, 8, 9, 10 when multiplied thrice will give 18, 21, 24, 27, 30.

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To express vector v as a linear combination of vectors v1, v2, and v3 and find Av, we need to know the components of vector v, and then we can set up and solve a system of linear equations to determine the coefficients c1, c2, and c3, and calculate Av using matrix multiplication.

In order to express vector v as a linear combination of vectors v1, v2, and v3, we need to know the components of vector v. The components of a vector represent its values along each coordinate axis or direction. Let's assume that the components of vector v are denoted as v_x, v_y, and v_z, representing its values along the x, y, and z axes respectively.

Given that, we can express vector v as a linear combination of vectors v1, v2, and v3 as follows:

v = c1 * v1 + c2 * v2 + c3 * v3

where c1, c2, and c3 are constants that represent the coefficients or weights of the respective vectors v1, v2, and v3 in the linear combination.

To find the coefficients c1, c2, and c3, we can set up a system of linear equations based on the components of vector v and the given vectors v1, v2, and v3. We can then solve this system of linear equations to determine the values of c1, c2, and c3.

Once we have the coefficients c1, c2, and c3, we can also calculate Av, which represents the vector resulting from the matrix multiplication of a matrix A (formed by stacking v1, v2, and v3 as columns) and the column vector containing c1, c2, and c3 as its elements.

In summary, to express vector v as a linear combination of vectors v1, v2, and v3 and find Av, we need to know the components of vector v, and then we can set up and solve a system of linear equations to determine the coefficients c1, c2, and c3, and calculate Av using matrix multiplication.

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The sequence above is an arithmetic sequence.

The common difference is -4.

In Mathematics and Geometry, the nth term of an arithmetic sequence can be calculated by using this expression:

aₙ =  a₁ + (n - 1)d

Where:

Next, we would determine the common difference as follows.

Common difference, d = a₂ - a₁

Common difference, d = 13 - 17 = 9 - 13

Common difference, d = -4.

Next, we would determine the common ratio as follows;

Common ratio, r = a₂/a₁

Common ratio, r = 13/17 ≠ 9/13

Common ratio, r = 0.7647 ≠ 0.6923

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The length of side x in simplest radical form with a rational denominator is[tex]3\sqrt{4.5}[/tex].

An isosceles triangle is a triangle with any two sides that are the same length and angles on opposite sides that are the same size.

The right triangle is isosceles, which indicates that its two legs are the same length. This length should be called "y".

Using the Pythagorean theorem, we know that:

[tex]y^{2}+y^{2}=9^{2}[/tex]

Simplifying this equation:

[tex]2y^{2}=81[/tex]

Dividing both sides by 2:

[tex]y^{2}[/tex] = 40.5

Taking the square root of both sides:

y = [tex]\sqrt{40.5}[/tex]

We can simplify this expression by factoring out a perfect square:

y = [tex]\sqrt{4.5*9}[/tex]

y = [tex]3\sqrt{4.5}[/tex]

Since we know that x has the same length as y, the length of x is also:

x = [tex]3\sqrt{4.5}[/tex]

Therefore, the length of side x in simplest radical form with a rational denominator is[tex]3\sqrt{4.5}[/tex].

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The fact that the sum can be approximated by an integral. we can approximate the sum as the area under the curve y=√x from x=1 to x=10000. This can be written as: ∫1^10000 √x dx

Using integration rules, we can evaluate this integral to get:
(2/3) * (10000^(3/2) - 1^(3/2))
This evaluates to approximately 66663.33. Therefore, an estimate for the sum ∑ i=1 to 10000 √i is 66663.33.

In mathematics, integrals are continuous combinations of numbers used to calculate areas, volumes, and their dimensions. Integration, which is the process of calculating compounds, is one of the two main operations of computation, [a] the other being derivative. Integration was designed as a way to solve math and physics problems like finding the area under a curve or determining velocity. Today, integration is widely used in many fields of science.

To estimate the sum of ∑ from i=1 to 10000 of √i using an integral, we'll approximate the sum with the integral of the function f(x) = √x from 1 to 10000.

The integral can be written as:

∫(from 1 to 10000) √x dx

To solve this integral, we first find the antiderivative of √x:

Antiderivative of √x = (2/3)x^(3/2)

Now, we'll evaluate the antiderivative at limits 1 and 10000:

(2/3)(10000^(3/2)) - (2/3)(1^(3/2))

(2/3)(100000000) - (2/3)

= (200000000/3) - (2/3)

= 199999998/3

Thus, the integral estimate of the sum from i=1 to 10000 of √i is approximately 199999998/3.

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Position vector r(t) is given by

[tex]r(t) = (1/3)t^3 i + e^t j + e^{5t} k.[/tex]

Here's the step-by-step explanation:

1. Integrate each component of r'(t) with respect to t:
  ∫[tex](t^2) dt = (1/3)t^3 + C1[/tex] (for i-component)
  ∫[tex](e^t) dt = e^t + C2[/tex] (for j-component)
  ∫[tex](5te^{5t}) dt = e^{5t} + C3[/tex] (for k-component)

2. Apply the initial condition r(0) = i + j + k:
  r(0) = (1/3)(0)³ + C1 i + e⁰ + C2 j + e⁵ˣ⁰ + C3 k = i + j + k
  This implies that C1 = 1, C2 = 0, and C3 = 0.

3. Plug in the values of C1, C2, and C3 to find r(t):
  [tex]r(t) = (1/3)t^3 + 1 i + e^t j + e^{5t} k[/tex]

So, the position vector r(t) is given by [tex]r(t) = (1/3)t^3 i + e^t j + e^{5t} k.[/tex]

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The value of ∂z/∂r at r=1 and s=0 is -9.

To find ∂z/∂r at r=1 and s=0, we need to use the chain rule:

∂z/∂r = ∂z/∂w * ∂w/∂x * ∂x/∂r

First, let's find ∂z/∂w:

f'(w) = dz/dw

Since f'(7) = -1, we know that dz/dw = -1 when w = 7.

Next, let's find ∂w/∂x and ∂x/∂r:

[tex]w = g(x,y) = g(2r^3 - s^2, res)[/tex]

∂w/∂x = ∂g/∂x = g_x = -2 (given)

∂x/∂r = [tex]6r^2[/tex](chain rule)

Now we can put it all together:

∂z/∂r = ∂z/∂w * ∂w/∂x * ∂x/∂r
    [tex]= (-1) * (-2) * 6r^2[/tex]
      [tex]= 12r^2[/tex]
So, at r=1 and s=0, we have:

[tex]∂z/∂r|r=1,s=0 = 12(1)^2 = 12[/tex]
To find ∂z/∂r at r=1 and s=0, we need to apply the chain rule. First, let's find the derivatives of x and y with respect to r and s:

∂x/∂r = 6r, ∂x/∂s = -2s
[tex]∂y/∂r = e^s, ∂y/∂s = re^s[/tex]

Now, we'll use the chain rule to find ∂z/∂r:

∂z/∂r = ∂z/∂w * (∂w/∂x * ∂x/∂r + ∂w/∂y * ∂y/∂r)

We have the following information:

gx(2,1) = ∂w/∂x = -2
gy(2,1) = ∂w/∂y = 3
f'(7) = ∂z/∂w = -1
g(2,1) = 7

Now, substitute the values for r=1 and s=0:

∂x/∂r = 6(1) = 6
∂y/∂r = e^(0) = 1

Plug in the given values:

∂z/∂r = (-1) * ((-2) * 6 + 3 * 1)

Calculate the result:

∂z/∂r = (-1) * (9)

∂z/∂r = -9

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The answer is 143.90. We used the formula for the standard error of the mean to find the expected value of the sample mean, then added 1.5 standard deviations to that value to find the answer.

To begin, we can use the formula for the standard error of the mean to calculate the expected value of the sample mean. The formula is as follows:

standard error of the mean = standard deviation / √(sample size)

In this case, the standard deviation is 8 minutes and the sample size is 40, so we can plug those values into the formula:

standard error of the mean = 8 / √(40)
standard error of the mean = 1.2649

Next, we can use the formula for the mean of the means to find the expected value of the sample mean:
mean of the means = average

In this case, the average is given as 142 minutes, so the mean of the means is also 142 minutes.

Now we can find the value that is 1.5 standard deviations above the expected value of the sample mean:

1.5 standard deviations = 1.5 * standard error of the mean
1.5 standard deviations = 1.5 * 1.2649
1.5 standard deviations = 1.8974

Finally, we add this value to the mean of the means to find the answer:

[tex]\bar{X} + 1.5\; standard \; deviations = 142 + 1.8974[/tex]

[tex]\bar{X} + 1.5 \;standard \;deviations = 143.8974[/tex]

Rounding to 2 decimal places, the answer is 143.90.

In summary, we used the formula for the standard error of the mean to find the expected value of the sample mean, then added 1.5 standard deviations to that value to find the answer. This calculation helps us understand the range of values we might expect to see in a sample of runners in this category.

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Therefore, the distance AB when the bridge is lifted to the position shown in the diagram is approximately 17.32 units.

Distance refers to the numerical measurement of the amount of space between two points, objects, or locations. It is a scalar quantity that has magnitude but no direction, and it is usually expressed in units such as meters, kilometers, miles, or feet. Distance can be measured in a straight line, or it can refer to the length of a path or route taken to travel from one point to another. It is an important concept in mathematics, physics, and other fields, and it has many practical applications in daily life, such as in navigation, transportation, and sports.

Here,

In the diagram, we can see that the bridge is divided into two halves and pivots around point B. When the bridge is lifted, it forms a right triangle with legs AB and BC, and hypotenuse AC. Since the bridge divides exactly in half, we can see that angle BCD is a right angle and angle ACD is equal to 30 degrees.

Using trigonometry, we can find the length of AB as follows:

tan(30) = AB/BC

tan(30) = AB/30

AB = 30 * tan(30)

AB ≈ 17.32

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Answer: Paul's front wheel completed 21,147 full revolutions.

Step-by-step explanation:

The distance traveled by the bike is equal to the circumference of the front wheel times the number of revolutions made by the wheel. The circumference C of a circle is given by the formula C = 2πr, where r is the radius of the circle.

In this case, the radius of the front wheel is 56 cm, so its circumference is:

C = 2πr = 2π(56 cm) ≈ 351.86 cm

To convert the distance traveled by Paul from kilometers to centimeters, we multiply by 100,000:

distance = 75.1 km = 75,100,000 cm

The number of full revolutions N made by the front wheel is therefore:

N = distance / C = 75,100,000 cm / 351.86 cm ≈ 213,470.2

However, we need to round down to the nearest integer since the wheel cannot complete a fractional revolution. Therefore:

N = 21,147

Therefore, Paul's front wheel completed 21,147 full revolutions.

Answer:

a. The total loss from buying and selling 300 shares at these prices can be calculated as follows:

Total cost of buying the stock = 300 shares x $41/share = $12,300

Total proceeds from selling the stock = 300 shares x $24.98/share = $7,494

Loss = Total cost - Total proceeds = $12,300 - $7,494 = $4,806

Therefore, the loss from buying and selling 300 shares of General Motors stock at these prices is $4,806.

b. To express the loss as a percent of the purchase price, we can use the following formula:

Loss percentage = (Loss / Total cost) x 100%

Substituting the values we found, we get:

Loss percentage = ($4,806 / $12,300) x 100% = 39.2%

Rounded to the nearest tenth of a percent, the loss percentage is 39.2%.

The equation of the tangent line is y = (x/2) + (√3/2).

To find an equation of the tangent line to the curve y = √(3x²) that is parallel to the line x - 2y = 1, we need to follow these steps:

        y - √3/2 = (1/2)(x - √3/2)

        y = (1/2)x + (√3/4)

Therefore, the equation of the tangent line to the curve y = √(3x²) that is parallel to the line x - 2y = 1 is y = (1/2)x + (√3/4).

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Option C is the correct answer: Select a row from the random number table. Read 20 single digits. Count the number of digits that are zeros.

Here's how you can use a random number table to simulate one trial of this situation:

By using a random number table, you can simulate this situation and get a sense of the likelihood of different outcomes. Keep in mind that the more trials you run, the more accurate your estimate of the actual distribution will be.

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Answer:

  RS = 38

Step-by-step explanation:

Given ∆XYZ ~ ∆RST with XY=5x-3, XZ=60, RS=3x+2, RT=40, you want the length of RS.

Corresponding sides of similar triangles have the same ratios:

  XY/XZ = RS/RT

  (5x -3)/60 = (3x +2)/40 . . . substitute given lengths

  2(5x -3) = 3(3x +2) . . . . . . . multiply by 120

  10x -6 = 9x +6 . . . . . . . . . . . eliminate parentheses

  x = 12 . . . . . . . . . . . . . . . add 6-9x to both sides

Using this value of x we can find RS:

  RS = 3x +2

  RS = 3(12) +2

  RS = 38

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Additional comment

The value of XY is 5(12)-3 = 57, and the above ratio equation becomes ...

  57/60 = 38/40 . . . . . both ratios reduce to 19/20.

Answer:

a, b, and d

Step-by-step explanation:

A, B, and D are Pythagorean triples (the sum of the squares of the first two numbers is equal to the square of the third number).