Find the radius of circle O if XY=10.

The parametric equations for the line are (-5 - t, 8 + 5t, 6 + t). To find a set of parametric equations for the line that passes through the point (-5, 8, 6) and is perpendicular to the plane given by -x + 5y + z = 8, follow these steps:

Step 1: Find the normal vector of the plane.
The coefficients of x, y, and z in the given equation represent the normal vector of the plane. So, the normal vector, N, is (-1, 5, 1).

Step 2: Use the normal vector as the direction vector for the line.
Since the line is perpendicular to the plane, its direction vector, D, will be parallel to the normal vector of the plane. So, D = N = (-1, 5, 1).

Step 3: Write the parametric equations for the line.
Using the point (-5, 8, 6) and the direction vector D = (-1, 5, 1), the parametric equations for the line are:

x(t) = -5 - t
y(t) = 8 + 5t
z(t) = 6 + t

So, the parametric equations for the line are (-5 - t, 8 + 5t, 6 + t).

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The weight that separates the bottom 5% is approximately 5.02 ounces.

To find the weights that separate the top 5% and the bottom 5%, we need to use the z-score formula and the standard normal distribution table.

First, let's find the z-score for the top 5%. Using the standard normal distribution table, we find that the z-score for the top 5% is approximately 1.645.

Next, we can use the formula z = (x - μ) / σ, where z is the z-score, x is the weight we're trying to find, μ is the mean, and σ is the standard deviation.

For the top 5%, we have:

1.645 = (x - 5.12) / 0.07

Solving for x, we get:

x = 5.12 + 1.645 * 0.07

x ≈ 5.22 ounces

Therefore, the weight that separates the top 5% is approximately 5.22 ounces.

To find the weight that separates the bottom 5%, we use the same process but with a negative z-score. The z-score for the bottom 5% is approximately -1.645.

-1.645 = (x - 5.12) / 0.07

Solving for x, we get:

x = 5.12 - 1.645 * 0.07

x ≈ 5.02 ounces

Therefore, the weight that separates the bottom 5% is approximately 5.02 ounces.

These weights could serve as limits used to identify which components should be rejected. Any component with a weight less than 5.02 ounces or greater than 5.22 ounces should be rejected.

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The amount of wax in the finished candle is 155.43 in³

The cost to purchase was for 14 candles is $325.50.

The area of the candle with glitters is 33π in².

We have,

The volume of a cylinder = πr²h

Now,

The finished candle is in the shape of a cylinder.

So,

Amount of wax in the finished candle.

= πr²h

= 3.14 x 3 x 3 x 5.5

= 155.43 in³

Now,

Cost per cubic inch = $0.15

This means,

The Cost of 155.43 in³ wax.

= 155.43 x 0.15

= $23.3145

Now,

The Cost of fourteen 155.43 in³ wax.

= 14 x 23.3145

= $325.50

Now,

The lateral surface area of the candle in cylindrical shape.

= 2πrh

= 2 x π x 3 x 5.5

= 33π in²

Thus,

The amount of wax in the finished candle is 155.43 in³

The cost to purchase was for 14 candles is $325.50.

The area of the candle with glitters is 33π in².

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The side lengths mentioned in option E are the sides of the right angled triangle.

Three given side lengths of a triangle a, b and c are said to be the sides of the right triangled triangle if -

a² = b² + c²

We can write for the given set of numbers in option 5 as -

(13)² = (12)² + (5)²

169 = 144 + 25

169 = 169

LHS = RHS

So, the side lengths mentioned in option E are the sides of the right angled triangle.

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To determine the absolute value of -13 using a number line, we would first locate the number -13 on the number line. Then, we would measure the distance between -13 and 0 (the origin of the number line) using units of the same size.

This distance would represent the absolute value of -13, In this case, the distance between -13 and 0 on the number line is 13 units. Therefore, the absolute value of -13 is 13, To use a number line to determine the absolute value of -13, follow these steps:

1. Locate the number -13 on the number line.
2. Measure the distance from -13 to 0. This distance represents the absolute value.
3. Count the number of units from -13 to 0. You will find that the distance is 13 units.

The absolute value of -13 is 13.

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Formula of  significance of  test as a function and value produces significance level is given by  F(x)  = 1 - [tex]e^{(-x /\mu)}[/tex], for x ≥ 0 with p-value  = [tex]e^{(-x /\mu)}[/tex], for x ≥ 0 and  x = μ log(1/α)respectively.

The significance of the test can be calculated using the following formula,

p-value = P(X > x),

where X is the duration of the observed call

And x is the cutoff value for distinguishing between voice and data calls.

Since X is an exponential random variable with expected value μ,

The probability density function of X is equal to,

f(x) = (1/μ) × [tex]e^{(-x /\mu)}[/tex], for x ≥ 0

The cumulative distribution function CDF of X is,

F(x) = P(X ≤ x)

      = [tex]\int_{0}^{x}[/tex] f(t) dt

      = 1 - [tex]e^{(-x /\mu)}[/tex] for x ≥ 0

The significance of the test is,

p-value = P(X > x)

             = 1 - F(x)

             = [tex]e^{(-x /\mu)}[/tex], for x ≥ 0

The value of x that produces a significance level α.

Since the exponential distribution is a continuous distribution,

Use the inverse of the CDF to find x.

Let F⁻¹ be the inverse of the CDF of X.

Then,

P(X > F⁻¹(1 - α)) = α

Substituting F(x) = 1 - [tex]e^{(-x /\mu)}[/tex], we get,

P(X > μ log(1/α)) = α

The value of x that produces a significance level α is,

x = μ log(1/α)

Therefore, the formula of  significance of the test as a function F(x)  = 1 - [tex]e^{(-x /\mu)}[/tex], for x ≥ 0 with p-value  = [tex]e^{(-x /\mu)}[/tex], for x ≥ 0 .

The value produces significance level is x = μ log(1/α).

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Igna could use the following steps to solve the quadrtic equation 2x² + 12x - 3 = 0:

2(x² + 6x + 9) = 18 + 3

and 2(x² + 6x) = 3

The correct answer answers are option (A) and (C)

Consider a quadrtic equation,

2x² + 12x - 3 = 0

2x² + 12x = 3

2(x² + 6x) = 3                 ............(1)

Now, divide both the sides of equation by 2

x² + 6x = 3/2

Now, we use the completing the square methhod.

Take the half of coefficient of x, square it and add it both sides of the equation.

i.e., x² + 6x + 9 = (3/2) + 9

(x + 3)² = (3/2) + 3²

x² + 6x + 9 = 9 + (3/2)

2(x² + 6x + 9) = 18 + 3         .........(2)

From (1) and (2) we can say that, the steps that she could use to solve the quadratic equation are:

2(x² + 6x + 9) = 18 + 3

and 2(x² + 6x) = 3

Therefore, the correct answer answers are option (A) and (C)

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Find the complete question below.

The probability that a customer pays in cash is 0.4. We want to find the probability that at least 10 out of 15 customers pay in cash. This is a binomial probability problem since we are interested in the number of successes (customers paying in cash) out of a fixed number of trials (15 customers).

Using the binomial probability formula, we can find the probability of getting exactly 10, 11, 12, 13, 14, or 15 customers paying in cash, and then add these probabilities together to get the probability of getting at least 10 customers paying in cash.

P(X ≥ 10) = P(X = 10) + P(X = 11) + P(X = 12) + P(X = 13) + P(X = 14) + P(X = 15)

P(X = k) = (n choose k) * p^k * (1-p)^(n-k)

where n = 15 (number of trials/customers), k = 10, 11, 12, 13, 14, or 15 (number of successes/customers paying in cash), p = 0.4 (probability of success/paying in cash)

P(X = 10) = (15 choose 10) * 0.4^10 * 0.6^5 = 0.196

P(X = 11) = (15 choose 11) * 0.4^11 * 0.6^4 = 0.213

P(X = 12) = (15 choose 12) * 0.4^12 * 0.6^3 = 0.174

P(X = 13) = (15 choose 13) * 0.4^13 * 0.6^2 = 0.098

P(X = 14) = (15 choose 14) * 0.4^14 * 0.6^1 = 0.031

P(X = 15) = (15 choose 15) * 0.4^15 * 0.6^0 = 0.005

P(X ≥ 10) = 0.196 + 0.213 + 0.174 + 0.098 + 0.031 + 0.005 = 0.717

Therefore, the probability that at least 10 out of 15 customers pay in cash is 0.717, or approximately 0.976 when rounded to three decimal places. The correct multiple-choice answer is 0.976.

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The highest temperature on the surface of the sphere is 64000sqrt(55), and the lowest temperature is -64000sqrt(55).

Using Lagrange multipliers, we want to optimize the temperature function subject to the constraint of the sphere equation:

F(x, y, z) = 400xyz

G(x, y, z) = x^2 + y^2 + z^2 - 22 = 0

The Lagrangian function is:

L(x, y, z, λ) = F(x, y, z) - λG(x, y, z) = 400xyz - λ(x^2 + y^2 + z^2 - 22)

Taking partial derivatives with respect to x, y, z, and λ and setting them to zero, we get:

400yz - 2λx = 0

400xz - 2λy = 0

400xy - 2λz = 0

x^2 + y^2 + z^2 - 22 = 0

Solving the first three equations for x, y, and z, we get:

x = 200yz/λ

y = 200xz/λ

z = 200xy/λ

Substituting these into the sphere equation, we get:

(200yz/λ)^2 + (200xz/λ)^2 + (200xy/λ)^2 - 22 = 0

Simplifying this equation and solving for λ, we get:

λ = ±80sqrt(55)

Using these values of x, y, z, and λ, we can find the corresponding temperature values:

T(x, y, z) = 400xyz = ±64000sqrt(55)

Therefore, the highest temperature on the surface of the sphere is 64000sqrt(55), and the lowest temperature is -64000sqrt(55).

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The rocket will reach its maximum height after 7.44 seconds.

We have,

The height of the rocket is given by the equation y = -16x² + 238x + 81, where y is the height in feet and x is the time in seconds after launch.

To find the time at which the rocket will reach its maximum height, we need to determine the vertex of the parabolic function given by the equation.

The x-coordinate of the vertex can be found using the formula:

x = -b / 2a

where a and b are the coefficients of the quadratic equation ax² + bx + c.

In this case,

a = -16 and b = 238

Substituting

x = -238 / 2(-16)

x = 7.44

Therefore,

The rocket will reach its maximum height after 7.44 seconds.

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The probability of getting 2 blue candies without replacement from a bag of 7 red candies and 5 blue candies can be calculated as follows:

First, we need to find the total number of ways to choose 2 candies from the bag, which is:

12 choose 2 = (12!)/(2!*(12-2)!) = 66

Next, we need to find the number of ways to choose 2 blue candies from the bag, which is:

5 choose 2 = (5!)/(2!*(5-2)!) = 10

Therefore, the probability of getting 2 blue candies without replacement from the bag is:

10/66 = 5/33

So the probability of getting 2 blue candies without replacement from the bag is 5/33, or approximately 0.152.

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we can make an educated guess and say that the total length of the six cars is likely to be close to the length of the roller coaster track they are traveling on.

To find the total length of the six cars, we need to add up the length of each car. Without any information about the length of each car, we cannot provide an exact answer. However, we can make an educated guess and say that the total length of the six cars is likely to be close to the length of the roller coaster track they are traveling on. This is because roller coaster tracks are designed to accommodate the length of the cars and provide a smooth ride. Therefore, the answer is likely to be close to the length of the roller coaster track.

Based on the information provided, I understand that you need to determine the total length of the six cars of a roller coaster. To provide an accurate answer, I would need some more details like the length of each car or the average length of a car. Once I have that information, I can help you find the closest total length of the six cars using the principles of geometry.

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It would take the trout 150 seconds to swim 100 yards.

We know that the trout swims at a speed of 2 feet per second. This means that for every second the trout swims, it covers a distance of 2 feet.

So, 100 yards x 3 feet/yard = 300 feet.

Now that we know the distance that the trout needs to cover, we can use the formula:

time = distance ÷ speed

where time is the time it takes for the trout to swim the given distance, distance is the distance the trout needs to cover (in feet), and speed is the speed at which the trout swims (in feet per second).

time = 300 feet ÷ 2 feet per second

time = 150 seconds.

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Based on the poll results, 49% of individuals like buying food at movies, while 42% do not. The poll has an error margin of ±4%. To determine if more people clearly like buying food at the movies in the population, we need to consider the error margin.

The error margin represents the range of values within which the actual population proportion likely lies. For those who like buying food at the movies, the range is 49% ± 4%, or 45% to 53%. For those who do not like buying food at the movies, the range is 42% ± 4%, or 38% to 46%.

There is an overlap between these two ranges (45%-46%), meaning that it is not possible to definitively conclude that more people in the population like buying food at the movies. While the poll results suggest a higher percentage of individuals like buying food at movies, the error margin prevents a clear determination. Further research or a larger sample size with a smaller error margin would be needed to make a more conclusive statement about the population's preference for buying food at the movies.

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Answer: The value of P is 14.

Step-by-step explanation: To find the value of P, we can use the formula for the mean of a set of numbers:

mean = (sum of numbers) / (number of numbers)

We know that the mean of the set {6, 8, 9, P, 13} is 10. So we can write:

10 = (6 + 8 + 9 + P + 13) / 5

Multiplying both sides by 5, we get:

50 = 6 + 8 + 9 + P + 13

Combining like terms, we get:

50 = 36 + P

Subtracting 36 from both sides, we get:

14 = P

Therefore, the value of P is 14.

The attributes of a continuous quantitative variable include the fact that it can take on any value within a range of values and there are no required gaps between values.

This means that there is a continuum of possible values that the variable can take on, without any set intervals or limits. Additionally, it is typically the result of measuring something, such as height, weight, or time, and can be represented by both integer and non-integer values. However, it is important to note that continuous variables cannot only be represented by integer values, as they can take on any value within their range.

Hi!The attributes of a continuous quantitative variable are:

1. It can take on any value within a range of values: Continuous variables can have an infinite number of values within a specified range, such as height or weight.
2. There are no required gaps between values: Continuous variables can have any value, including fractions and decimals, without restrictions on the difference between values.
4. It is typically the result of measuring something: Continuous variables often represent measurements like distance, time, or temperature.

Note that "it can only be represented by integer values" is not an attribute of continuous variables, as they can have non-integer values as well.

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The complementary and particular solutions of coefficients to get the general solution: y(t) = C1*e^(2t) + C2*e^(13t) + (1/12)*e^(5t).


First, identify the complementary solution by solving the homogeneous equation: y′′−9y′+26y=0. The characteristic equation is r^2 - 9r + 26 = 0. Factoring, we get (r-2)(r-13)=0. Therefore, the complementary solution is yc(t) = C1*e^(2t) + C2*e^(13t).

Next, identify the particular solution. Since the right-hand side of the original equation is 1e^(5t), we guess a particular solution of the form: yp(t) = A*e^(5t).

Now, find the first and second derivatives of yp(t):
yp'(t) = 5A*e^(5t),
yp''(t) = 25A*e^(5t).

Substitute yp(t) and its derivatives into the original equation: 25A*e^(5t) - 9(5A*e^(5t)) + 26(A*e^(5t)) = 1e^(5t).

Simplify the equation: (12A)e^(5t) = 1e^(5t).

Now, solve for A: A = 1/12.

Thus, the particular solution is yp(t) = (1/12)*e^(5t).

Combine the complementary and particular solutions to get the general solution:
y(t) = C1*e^(2t) + C2*e^(13t) + (1/12)*e^(5t).

This is the general solution to the given differential equation using the method of undetermined coefficients.

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Complete question:

Use the method of undetermined coefficients to find one solution of

y′′−9y′+26y=1e5t. y= ?

Answer:

Step-by-step explanation:

Since Pens/Pencils is a constant rate (equal rate), we find that
[tex]\frac{13}{78} = \frac{1}{6}[/tex]  and  [tex]\frac{22}{132} = \frac{1}{6}[/tex]. So 1/6 is that rate

We have B / 162 = 1/6
               B = 162 / 6
               B = 27

So the answer is 27

Answer:

answer is 27

Step-by-step explanation:

The average value of f(x) = 3x^2 + 5x on the interval [3, 7] is 109, and the value of C for which f(c) = f_average is approximately 3.99.

a) To determine the average value of f(x) on the interval [7, 3], you need to calculate the integral of the function over the interval and divide it by the width of the interval. First, we need to correct the interval [7, 3] to [3, 7] since the smaller number should come first. The width of the interval is 7 - 3 = 4.

∫(3x^2 + 5x) dx from 3 to 7 = [(x^3 + (5/2)x^2) evaluated from 3 to 7] = [(7^3 + (5/2)7^2) - (3^3 + (5/2)3^2)] = 436.

Now, we divide this by the width of the interval: f_average = 436/4 = 109.

b) To find the value of C, we need to solve f(c) = f_average on the interval [3, 7]. We are given that f(c) = f_average = 109, so we set the function equal to the average value and solve for c:

3c^2 + 5c = 109

3c^2 + 5c - 109 = 0

This quadratic equation can be solved using the quadratic formula, factoring, or other methods, but it does not factor easily. Using the quadratic formula, you will find two possible values for c: approximately 3.99 and -9.16. Since -9.16 is not within the interval [3, 7], the value of c is approximately 3.99.

So, On the range [3, 7], the average value of f(x) = 3x2 + 5x is 109, and the value of C for which f(c) = f_average is roughly 3.99.

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Complete question:

f(x) = 3x^2 + 5x in (7,3) a) Determine faverage in [7,3] b) Find the value of C, f(c)= fave in [7,3]

The statement that best describes the variance in a data set is "it is the square of the standard deviation." Variance is a measure of how spread out the data is from the mean, and it is calculated by finding the average of the squared differences from the mean.

The standard deviation is the square root of the variance and represents the average distance from the mean. Therefore, the variance is the square of the standard deviation. The other statements are not accurate descriptions of variance. The variance is not related to the size of the sample or the correlation coefficient, and it does not increase along with the mean. The median is a measure of central tendency, not variability.

The statement that best describes the variance in a data set is: it is the square of the standard deviation. Variance measures the dispersion of data points from the mean, and it helps to understand the spread in the data set. It is not the size of the sample, nor another term for median, nor equal to the correlation coefficient. The variance does not typically increase along with the mean, as it is a separate measure of dispersion. Standard deviation is the square root of variance, making variance the square of the standard deviation.

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The equation:  f(x,y)= √x⁴+4xy+y⁴+10fx(x,y) = fy(x,y)=fx (2, - 2) = fy(1,3) = (2(3)³ + 4(1)) / (2√(1)⁴ + 4(1)(3) + 2(3)⁴) = 26/38 = 13/19

To find the partial derivatives fx(x, y) and fy(x, y) for the equation f(x, y) = √(x⁴ + 4xy + y⁴ + 10), we will differentiate f with respect to x and y, respectively. fx(x, y) = ∂f/∂x = (1/2)(x⁴ + 4xy + y⁴ + 10)^(-1/2) * (4x³ + 4y) fy(x, y) = ∂f/∂y = (1/2)(x⁴ + 4xy + y⁴ + 10)^(-1/2) * (4x + 4y³)

Now, we'll find the values of fx(2, -2) and fy(1, 3): fx(2, -2) = (1/2)((2^4) + 4(2)(-2) + (-2)^4 + 10)^(-1/2) * (4(2)^3 + 4(-2)) = -0.5 fy(1, 3) = (1/2)((1^4) + 4(1)(3) + (3)^4 + 10)^(-1/2) * (4(1) + 4(3)^3) = 0.0625 So, we have: fx(x, y) = (1/2)(x⁴ + 4xy + y⁴ + 10)^(-1/2) * (4x³ + 4y) fy(x, y) = (1/2)(x⁴ + 4xy + y⁴ + 10)^(-1/2) * (4x + 4y³) fx(2, -2) = -0.5 fy(1, 3) = 0.0625

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Answer:

D)619.1

Step-by-step explanation:

The formula for finding the volume of this figure, a cone, is:

[tex]V=\pi r^{2} \frac{h}{3}[/tex]

and we can substitute our values into it:

[tex]V=(3.14) 6.5^{2} \frac{14}{3}[/tex]

to get V=619.1

Hope this helps :)

The smallest possible number of members of the committee is 5005.

Let [tex]$v_i$[/tex] be the number of votes received by the i th candidate, and let [tex]$p_i$[/tex]be the percentage of votes received by the i th candidate. We know that[tex]$p_i = \frac{v_i}{m} \times 100$[/tex], where m$is the total number of committee members.

We are given that[tex]$p_i + 1 \leq v_i$[/tex], which can be rewritten as  [tex]$\frac{v_i}{m} \geq \frac{101}{100} \times \frac{1}{27}$[/tex]

Since[tex]$\sum_{i=1}^{27} \frac{1}{27} = 1$[/tex], it follows that [tex]$\sum_{i=1}^{27} \frac{v_i}{m} \geq \frac{27 \times 101}{100 \times 27} = \frac{101}{100}$[/tex]. Therefore, the total number of votes received by the candidates is at least [tex]$\frac{101m}{100}$[/tex]. Since each committee member gave exactly one vote, it follows that [tex]$m \geq \frac{101m}{100}$[/tex], which implies that[tex]$m \geq 5005$.[/tex]

To show that 5005 committee members is indeed possible, we can let[tex]$v_1 = 2777$[/tex],[tex]$v_2 = 1389$, $v_3 = 693$,[/tex] and [tex]$v_i = 0$[/tex] for[tex]$4 \leq i \leq 27$[/tex]. Then the percentage of votes received by the $i$th candidate is [tex]$\frac{v_i}{m} \approx 0.01960784$[/tex], which is less than 1% away from [tex]$1.960784 \d = \frac{1}{27} \times 100%$[/tex].

Moreover, [tex]$v_1 + v_2 + v_3 = 4859$[/tex], which is 1 less than 4858, so each percentage is at least 2% less than the corresponding number of votes. Therefore, the smallest possible number of committee members is 5005.

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The income has increased by 10%.

Let's assume that the original price of the product was P, and the original quantity sold was Q. Then, the original income (revenue) would be:

Income1 = P x Q

After the price decreased by 12%, the new price would be:

P2 = P - 0.12P = 0.88P

And the new quantity sold would be 25% higher than the original quantity, or:

Q2 = 1.25Q

The new income would be:

Income2 = P2 x Q2 = (0.88P) x (1.25Q) = 1.1PQ

Therefore, the percent change in income would be:

[(Income2 - Income1) / Income1] x 100% = [(1.1PQ - PQ) / PQ] x 100%

= (0.1PQ / PQ) x 100%

= 10%

So the income has increased by 10%.

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The CDF of Y is: FY(y) = FX((2 - y)/3)

= {1 - [tex]e^{(-4(2-y)/3)}[/tex], for y ∈ (-∞, 2]

{0, for y < -∞

To find the CDF of Y, we need to first find the range of Y:

Y = g(X) = 2 - 3X

When X = 0, Y = 2

As X approaches infinity, Y approaches negative infinity

Thus, the range of Y is (-∞, 2].

Now, let's find the CDF of Y for y ∈ (-∞, 2]:

FY(y) = P(Y ≤ y) = P(2 - 3X ≤ y)

Solving for X:

X = (2 - y)/3

Since FX(x) = P(X ≤ x), we can substitute (2 - y)/3 for x in FX(x) to get:

FX((2 - y)/3) = P(X ≤ (2 - y)/3)

= 1 - [tex]e^{(-4(2-y)/3)}[/tex], for y ∈ (-∞, 2]

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Answer:

= -77

Step-by-step explanation:

11/2 x -14 =

Express 11/2 (-14) as a single fraction.

11(-14)/2

Multiply 11 and -14 to get -154.

-154/2

Divide -154 by  2 to get -77.

-77.

The distance between points A and B on the complex plane is 5·i

The complex plane is the plane formed by complex numbers using a Cartesian coordinate system.

The coordinates of the point A and B the complex plane are A(4, 3), and B(4, -2)

The distance between A and B can be found by representing the coordinates as complex numbers as follows;

A(4, 3) = 4 + 3·i

B(4, -2) = 4 - 2·i

The distance between A and B is therefore;

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a.) Both defective cylinders are selected:  the probability of both defective cylinders being selected is 1/28. b.) No defective cylinder is selected:  the probability of no defective cylinder being selected is 15/28. c.) At least one defective cylinder is selected: the probability of selecting at least one defective cylinder is 13/28.

a. The probability of selecting both defective cylinders can be calculated by multiplying the probability of selecting the first defective cylinder (which is 2/8, or 1/4 since there are 2 defective cylinders out of 8 total) by the probability of selecting the second defective cylinder given that the first one was already selected (which is 1/3 since there are now only 3 cylinders left and only 1 of them is defective). So the probability of both defective cylinders being selected is (1/4) x (1/3) = 1/12.
b. The probability of selecting no defective cylinder can be calculated by selecting two non-defective cylinders from the six remaining ones. The probability of selecting the first non-defective cylinder is 6/8 (or 3/4) and the probability of selecting the second non-defective cylinder given that the first one was already selected is 5/7. So the probability of selecting no defective cylinder is (3/4) x (5/7) = 15/28.
c. The probability of selecting at least one defective cylinder can be calculated by subtracting the probability of selecting no defective cylinder from 1 (since either at least one defective cylinder is selected or no defective cylinder is selected). So the probability of selecting at least one defective cylinder is 1 - (15/28) = 13/28.

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