1. An online store sells sportswear. Of all online sales, it is known that the amount of each sale is right skewed with mean $55 and standard deviation $19. A sample of 50 sales is randomly selected.(a). Find the mean of the sampling distribution of the mean amount spent per sale for samples of size 50.(b).Find the standard deviation of the sampling distribution from part (a). (Round your answer to three decimal places.)

The sum of the series is 15 square units.

The formula for the nth partial sum of a series is given by Sn = a1 + a2 + a3 + ... + an, where a1, a2, a3, ... are the individual terms of the series.

In this case, we are given the nth partial sum sn = 7 − 5(0.8)n.

We can use this expression to find the individual terms of the series as follows:

s1 = 7 - 5[tex](0.8)^{1}[/tex] = 3

s2 = 7 - 5[tex](0.8)^{2}[/tex] = 4.6

s3 = 7 - 5[tex](0.8)^{3}[/tex] = 5.48

s4 = 7 - 5[tex](0.8)^{4}[/tex]= 5.984

We can see that the series is a decreasing geometric series with first term a1 = 3 and common ratio r = 0.8.

The sum of an infinite geometric series with first term a1 and common ratio r, where |r| < 1, is given by S = a1 / (1 - r).

Using this formula, we can find the sum of our series as:

S = a1 / (1 - r) = 3 / (1 - 0.8) = 15

Therefore, the sum of the series is 15 square units.

to know more about series

brainly.com/question/15415793

#SPJ1

Step-by-step explanation:

We can prove the statement by mathematical induction.

Base Case: For n = 0, we have 9n - 3n = 1, which is divisible by 6, since 1 = 6*0 + 1.

Inductive Step: Assume that 6 divides 9k - 3k for some non-negative integer k. We need to show that 6 also divides 9(k+1) - 3(k+1).

Starting with 9(k+1) - 3(k+1), we can simplify it as follows:

9(k+1) - 3(k+1) = 9k + 9 - 3k - 3

= (9k - 3k) + (9 - 3)

= 6k + 6

Since 6 divides both 6k and 6, it also divides their sum, 6k + 6. Therefore, we have shown that 6 divides 9(k+1) - 3(k+1).

By the principle of mathematical induction, we can conclude that 6 divides 9n - 3n for all non-negative integers n.

So, the equation of the plane tangent to the surface at point P(40, 80, 12) is: z = x - (9/5)y + 4.

An equation is a mathematical statement that shows the equality of two expressions. It usually consists of two sides separated by an equal sign (=). The expressions on both sides of the equal sign can include numbers, variables, and mathematical operations such as addition, subtraction, multiplication, and division.

Here,

To find the equation of the plane tangent to the surface at point P(40, 80, 12), we need to first find the partial derivatives of the function z(x,y) with respect to x and y, and evaluate them at point P. Then we can use the gradient vector of the surface at point P to find the equation of the tangent plane.

Given,

r = (9u+v)i + 5u²j + (4u – v)k

We have, x = 9u + v, y = 5u², z = 4u - v

So, z(x, y) = 4u - v = 4(1/4(x-9y/5))-1/5(y-v) = (x-9y/5) - (y-v)/5

Taking partial derivatives of z with respect to x and y, we get:

∂z/∂x = 1, and ∂z/∂y = -9/5

Evaluating these at point P(40, 80, 12), we get:

∂z/∂x = 1, and ∂z/∂y = -9/5

So, the gradient vector of the surface at point P is:

grad z = (1)i - (9/5)j

Now, the tangent plane at point P is given by the equation:

z - z(P) = ∇z · (r - r(P))

where z(P) = z(40, 80) = 12, r(P) = <40, 80, 12>, and ∇z = (1)i - (9/5)j

Substituting the values, we get:

z - 12 = (1)(x - 40) - (9/5)(y - 80)

Simplifying, we get:

z = x - (9/5)y + 12 - 8

So, the equation of the plane tangent to the surface at point P(40, 80, 12) is:

z = x - (9/5)y + 4

To know more about equation,

https://brainly.com/question/649785

#SPJ1

The given statement is True.

A correlation coefficient measures the strength and direction of the linear relationship between two variables. The range of possible values for a correlation coefficient is from -1 to +1, where -1 indicates a perfect negative linear relationship, 0 indicates no linear relationship, and +1 indicates a perfect positive linear relationship.

Therefore, a correlation coefficient of -0.9 indicates a strong negative linear relationship between the two variables, whereas a correlation coefficient of 0.5 indicates a moderate positive linear relationship between the two variables. Thus, the correlation coefficient of -0.9 indicates a stronger linear relationship than the correlation coefficient of 0.5.

Learn more about correlation coefficient

brainly.com/question/27226153

#SPJ11

Answer:

(-2,-1)

Step-by-step explanation:

see photo

The curve starts at (1,1) and goes to the right, approaching the x-axis but never touching it. It also approaches the y-axis but never touches it. The curve is traced in the direction from (1,1) towards the positive x-axis as the parameter t increases.

To eliminate the parameter, we can solve for t in terms of x and substitute into the equation for y:

x = et  --> t = ln(x)
y = e⁽⁻⁴ᵗ⁾ = e⁽⁻⁴⁾ln(x)) = x⁽⁻⁴⁾
So the Cartesian equation of the curve is y = x⁽⁻⁴⁾.

To sketch the curve, we can notice that as x increases, y decreases rapidly (since it is raised to the negative fourth power). The curve approaches the y-axis but never touches it. It also approaches the x-axis but is never quite horizontal. To indicate the direction in which the curve is traced as the parameter increases, we can use an arrow pointing to the right (since t = ln(x) increases as x increases).

Learn more about graphs here: brainly.com/question/17267403

#SPJ11

The number of times the bsearch method is called depends on the implementation of the binary search algorithm and the contents of the nums array. The initial call to the bsearch method is counted as one call.

After that, each subsequent call is made as the algorithm narrows down the search space by dividing it in half. The maximum number of calls can be calculated as log2(nums.length) + 1, where log2 is the base-2 logarithm.

This includes the initial call. However, the exact number of calls may be less than the maximum, depending on the data and target value (-100 in this case).

Know more about Algorithm here:

https://brainly.com/question/24398433

#SPJ11

Answer: 260

Step-by-step explanation:

Use proportions:

65/25 = x/100

cross multiply the proportions:

25x = 6500

solve your equation:

x = 260

The number is 260.

Let's start by finding the number we're working with.

We know that 25% of the number is 65, so we can set up an equation:

0.25x = 65

To solve for "x", we can divide both sides of the equation by 0.25:

x = 65 / 0.25

x = 260

So the number we're working with is 260.

Next, we need to find 40% of the same number:

0.40(260) = 104

Now we can use this information to find 15% of the same number:

We can set up a proportion:

40% is to 104 as 15% is to x

0.40/104 = 0.15/x

To solve for "x", we can cross-multiply:

0.40x = 104(0.15)

0.40x = 15.6

x = 39

So 15% of the same number is 39.

Each point (x, y) on the graph of h(x) becomes the point (x - 3, y - 3) on v(x).

Each point (x, y) on the graph of h(x) becomes the point (x + 3, y + 3) on w(x).

In Mathematics and Geometry, the translation a geometric figure or graph to the left simply means subtracting a digit from the value on the x-coordinate of the pre-image;

g(x) = f(x + N)

On the other hand, the translation a geometric figure to the right simply means adding a digit to the value on the x-coordinate (x-axis) of the pre-image;

g(x) = f(x - N)

Since the parent function is v(x) = h(x + 3), it ultimately implies that the coordinates of the image would created by translating the parent function to the left by 3 units.

Read more on function and translation here: brainly.com/question/31559256

#SPJ1

Alvin's total payment to the store if the donations wasn't taxed is $54.18.

Cost of shirts = $12.50

Cost of pants = $27

Cost of socks = $6.25

Donation to charity = $5

Tax = 7.5%

Total = $12.50 + $27 + $6.25

= $45.75

Total payment = $45.75 + (0.075 ×45.75) + 5

= $54.18125

Hence, the total payment Alvin made to the store is $54.18

Read more on tax:

https://brainly.com/question/25783927

#SPJ1

The maximum likelihood estimators of θ and λ are θ-cap = min(X1, X2, ..., Xn) and λ-cap = n / (Σ(Xi - θ-cap)). For the given data, the estimates of θ and λ are θ-cap = 0.64 and λ-cap = 10 / (Σ(Xi - 0.64)).

To find the maximum likelihood estimators (MLE) for the shifted exponential distribution, first obtain the likelihood function L(θ, λ) by multiplying the pdf of each observation.

Take the natural logarithm of the likelihood function to get the log-likelihood function, and then differentiate it with respect to θ and λ. Set these partial derivatives to zero to find the MLEs.

For the given data, to find θ-cap, choose the smallest value, which is 0.64. To find λ-cap, subtract θ-capfrom each observation, sum the differences, and divide the number of observations (10) by this sum. This gives λ-cap = 10 / (Σ(Xi - 0.64)).

To know more about partial derivatives  click on below link:

https://brainly.com/question/31397807#

#SPJ11

Vik spends 33.28% of the total cost on airport tax, rounded to 1 decimal place.

Converting €50 to pounds using the exchange rate, we get:

€50 = £50/1.14 = £43.86 (rounded to 2 decimal places)

The total cost is:

£88 + £43.86 = £131.86

The proportion of the total cost that Vik spends on airport tax is:

£43.86 / £131.86 = 0.3328

To convert this to a percentage, we multiply by 100:

0.3328 × 100 = 33.28%

Therefore, Vik spends 33.28% of the total cost on airport tax, rounded to 1 decimal place.

to know more about cost

brainly.com/question/30045916

#SPJ1

a)1. True

2.False

3.True

4).False

b)Without knowing the sample size and standard deviation, we cannot determine the exact 90% confidence interval.

(a) For the content loaded Central Middle School data:

1. True: There is a 95% probability that μ (mean height) is between 54 and 58 inches.

This is the correct interpretation of the 95% confidence interval.

2. False: The confidence interval doesn't tell us the probability of the true mean or the margin of error being exactly as given. It only tells us the range where the true mean is likely to fall with 95% confidence.

3. True: If we took many additional random samples of the same size and from each computed a 95% confidence interval for μ, approximately 95% of these intervals would contain μ. This is the definition of a 95% confidence interval.

4. False: It's incorrect to say that μ would fall between 54 and 58 95% of the time. The correct interpretation is that if we computed multiple 95% confidence intervals, approximately 95% of those intervals would contain the true mean height.

(b) To determine the 90% confidence interval based on the same data:

Without knowing the sample size and standard deviation, any of the above answers could be the 90% confidence interval. Confidence intervals depend on the sample size, standard deviation, and desired confidence level. With the information given, we cannot determine the exact 90% confidence interval.

To know more about Mean:

https://brainly.com/question/31101410

#SPJ11

The polar coordinates of the point (3, -5) are (r, θ) = (√34, 5.25) where r > 0 and 0 ≤ θ < 2π. Since tan() is negative, we know that lies in either the second or fourth quadrant.

To find the polar coordinates (r, ) of the point (3, -5), we can use the following formulas:
r = sqrt(x^2 + y^2)
tan() = y/x
Plugging in the values for x and y, we get:
r = sqrt(3^2 + (-5)^2) = sqrt(34)
tan() = -5/3
Since tan() is negative, we know that lies in either the second or fourth quadrant. To determine which one, we can use the fact that tan() = y/x. In the second quadrant, both x and y are negative, which would give us a positive value for tan(). Therefore, must be in the fourth quadrant.
To find the angle , we can use the inverse tangent function (tan^-1) on our calculator. However, we need to adjust the result to account for the fact that we are in the fourth quadrant. Specifically, we need to add 2 radians (or 360 degrees) to the result. So:
tan^-1(-5/3) = -1.03 radians
+ 2 radians = 0.97 radians
Therefore, the polar coordinates of the point (3, -5) are (sqrt(34), 0.97 radians).
To find the polar coordinates (r, θ) of the point (3, -5) where r > 0 and 0 ≤ θ < 2π, you can use the following formulas:
r = √(x^2 + y^2)
θ = arctan(y/x)
Plugging in the Cartesian coordinates (3, -5) for x and y:
r = √(3^2 + (-5)^2) = √(9 + 25) = √34
Since the point is in the fourth quadrant (x > 0 and y < 0), we'll adjust the angle:
θ = arctan(-5/3) ≈ -1.03 radians
To convert θ to the range 0 ≤ θ < 2π, add 2π:
θ = -1.03 + 2π ≈ 5.25 radians
So, the polar coordinates of the point (3, -5) are (r, θ) = (√34, 5.25) where r > 0 and 0 ≤ θ < 2π.

To learn more about polar coordinates, click here:

brainly.com/question/11657509

#SPJ11

Recurrence relation for t(n):

t(n) = 4t(n/2) + 1, where n > 1

When we compute the square of an n-bit number, we can express it as:

n² = (n/2)² + (n/2)² + n

This means that we can compute the square of an n-bit number by recursively computing the square of an (n/2)-bit number twice, and adding the result to the product of the two (n/2)-bit numbers.

Each recursion involves 4 additions/subtractions (for adding/subtracting the two intermediate results), and 1 addition (for adding the final result). Therefore, the number of operations t(n) required to compute the square of an n-bit number can be expressed as:

t(n) = 4t(n/2) + 1, where n > 1

The base case is t(1) = 0, since computing the square of a 1-bit number requires no operations.

Learn more about Recurrence relation.

brainly.com/question/31384990

#SPJ11

Recurrence relation for t(n):

t(n) = 4t(n/2) + 1, where n > 1

When we compute the square of an n-bit number, we can express it as:

n² = (n/2)² + (n/2)² + n

This means that we can compute the square of an n-bit number by recursively computing the square of an (n/2)-bit number twice, and adding the result to the product of the two (n/2)-bit numbers.

Each recursion involves 4 additions/subtractions (for adding/subtracting the two intermediate results), and 1 addition (for adding the final result). Therefore, the number of operations t(n) required to compute the square of an n-bit number can be expressed as:

t(n) = 4t(n/2) + 1, where n > 1

The base case is t(1) = 0, since computing the square of a 1-bit number requires no operations.

Learn more about Recurrence relation.

brainly.com/question/31384990

#SPJ11

The dimensions of the poster are width = 2 inches & length = 6 inches. Let's assume the width of the poster to be x inches. According to the problem, the length of the poster is 2 more inches than two times its width, which can be represented as 2x+2.

We are also given that the area of the poster is 12 square inches.

We know that the area of a rectangle is given by length times width, so we can set up an equation:-

length × width = area

(2x+2) × x = 12

Expanding the left side, we get:-

2x² + 2x = 12

Subtracting 12 from both sides, we get:-

2x² + 2x - 12 = 0

Dividing both sides by 2, we get:-

x² + x - 6 = 0

This is a quadratic equation that can be factored as:

(x + 3) (x - 2) = 0

Therefore, either x+3=0 or x-2=0.

If x+3=0, then x=-3, which doesn't make sense since we can't have a negative width.

If x-2=0, then x=2, which is a valid width.

We can use this value of x to find the length:-

length = 2x + 2 = 2(2) + 2 = 6

Therefore, the dimensions of the poster are width = 2 inches & length = 6 inches.

To know more about length dimensions-

brainly.com/question/30952215

#SPJ4

We can calculate the curvature k as:

k = |dT/ds| / |dr/ds|

[tex]= |d^2 r(s)/ds^2| / |dr/ds|^3[/tex]

To find the curvature k of a curve given by the vector-valued function r(s), where s is the arc length parameter, we use the following formula:

k = |dT/ds| / |dr/ds|

where T(s) is the unit tangent vector and r'(s) is the velocity vector.

To find T(s), we differentiate r(s) with respect to s:

T(s) = dr(s)/ds

Then, we normalize T(s) to obtain the unit tangent vector:

T(s) = dr(s)/ds / |dr(s)/ds|

Next, we differentiate T(s) with respect to s to obtain the unit normal vector N(s):

[tex]N(s) = d^2 r(s)/ds^2 / |d r(s)/ds|[/tex]

Finally, we can calculate the curvature k as:

k = |dT/ds| / |dr/ds|

[tex]= |d^2 r(s)/ds^2| / |dr/ds|^3[/tex]

So, to find the curvature k of the curve given by the vector-valued function r(s), we need to calculate r(s), dr(s)/ds, and[tex]d^2 r(s)/ds^2[/tex] and plug them into the above formula.

Learn more about curvature k of the curve

brainly.com/question/12982907

#SPJ11

Yes, ΔP'Q'R' is a 180° rotation about the origin of ΔPQR as the image coordinates obtained using the rotation formula are the opposite of the preimage coordinates. The comparison of coordinates indicates the transformation. The correct answers are A), D) and B).

The coordinates of the preimage triangle PQR are P(2, 3), Q(4, 4), and R(4, 3). To determine if triangle P'Q'R' is a 180° rotation about the origin of triangle PQR, we need to apply the transformation to each vertex of the preimage and compare the resulting image coordinates.

Using the rotation formula, we can find the image coordinates

P' = (x cos 180° - y sin 180°, x sin 180° + y cos 180°) = (-2, -3)

Q' = (x cos 180° - y sin 180°, x sin 180° + y cos 180°) = (-4, -4)

R' = (x cos 180° - y sin 180°, x sin 180° + y cos 180°) = (-4, -3)

Comparing the image coordinates with the preimage coordinates, we can see that P'Q'R' is a 180° rotation of PQR about the origin. Therefore, the answer is "Yes" for the first dropdown.

For the second dropdown, we choose "Coordinates" because we are comparing the image and preimage coordinates.

For the third dropdown, we choose "are" because the image and preimage triangles are opposites, as one is a rotation of the other. The correct options are A), D) and B).

To know more about transformation:

https://brainly.com/question/14835332

#SPJ1

Sample standard deviation is approximately 0.6129.

We add all the numbers and divide by the sample size:

(0.1 + 0 - 0.3 - 1.4 + 0) / 5 = -0.32/5 = -0.064

Therefore, the sample mean is -0.064.

To find the sample variance, we need to first find the deviations of each measurement from the sample mean. We subtract the sample mean from each measurement to get:

0.1 - (-0.064) = 0.164

0 - (-0.064) = 0.064

-0.3 - (-0.064) = -0.236

-1.4 - (-0.064) = -1.336

0 - (-0.064) = 0.064

Then, we square each deviation:

0.164² = 0.026896

0.064² = 0.004096

(-0.236)² = 0.055696

(-1.336)² = 1.787296

0.064² = 0.004096

We take the average of these squared deviations to get the sample variance:

(0.026896 + 0.004096 + 0.055696 + 1.787296 + 0.004096) / 5 = 0.375416

Therefore, the sample variance is 0.375416.

To find the sample standard deviation, we take the square root of the sample variance:

sqrt(0.375416) = 0.6129

Therefore, the sample standard deviation is approximately 0.6129.

Learn more about standard deviation.

brainly.com/question/23907081

#SPJ11

Answer:

5.33

Step-by-step explanation:

The amount of a substance decaying exponentially with a half-life can be modeled using the formula A = A₀ * 2^(-t / h), where A is the amount remaining after time t, A₀ is the initial amount of substance, t is the time elapsed, and h is the half-life of the substance. Using the fact that initially there were 12 grams of the substance, and after 2 hours there were 7 grams, we can solve for the half-life h. Substituting the values into the equation 7 = 12 * 2^(-2 / h) and solving, we get that h is approximately 4.145 hours. Finally, we can use the formula A = A₀ * 2^(-t / h) to find the amount of substance remaining after 3 hours. Plugging in A₀ = 12, t = 3, and h ≈ 4.145, we get A ≈ 5.33 grams. Rounding to the nearest hundredth, we conclude that approximately 5.33 grams of the substance will remain after 3 hours.

By using special right triangles to calculate the distance, we get to know that  WX is [tex]7\sqrt{3}[/tex],  XY is equal to 7 and  YZ is equal to 7[tex]\sqrt{2}[/tex]

A triangle is said to be right-angled if one of its inner angles is 90 degrees, or if any one of its angles is a right angle. The right triangle or 90-degree triangle is another name for this triangle.

the matching for the given questions are

            1 - B : (WY-14)

            2-C : (YX-7)

            3-A : (YZ- [tex]7\sqrt{2}[/tex])

Here there are two right-angled triangles, that are WXY & YXZ.  

the length of WX is [tex]7\sqrt{3}[/tex].

here we use the trigonometry principles as we know the angle and one side length.

                    cos 30°=[tex]\frac{7\sqrt{3} }{x}[/tex]

                    [tex]\frac{\sqrt{3} }{2}[/tex]= [tex]\frac{7\sqrt{3} }{x}[/tex]

                 therefore; x=14 ⇒ WY = 14

 for knowing XY⇒

                   sin 30° = [tex]\frac{x}{14}[/tex]

                    [tex]\frac{1}{2}[/tex] = [tex]\frac{x}{14}[/tex]

                    ⇔ x=7

                  therefore, XY is equal to 7.

and finally for YZ,

                  sin 45°= [tex]\frac{7}{y}[/tex]

                    [tex]\frac{1}{\sqrt{2} }[/tex] = [tex]\frac{7}{y}[/tex]

                    therefore, y=7[tex]\sqrt{2}[/tex]

                 YZ is equal to 7[tex]\sqrt{2}[/tex]

To understand more about trigonometry visit:

brainly.com/question/29002217

#SPJ1

Answer:

40 miles

Step-by-step explanation:

If Nicole has driven 20 miles and this is only half the distance, then the total length of her drive would be 40 miles.

We can determine this with a simple algebraic equation:

Let x be the total length of her drive.

We know that Nicole has already driven one-half of the distance, which can be represented as:

20 = 1/2x

Multiplying both sides by 2, we get:

40 = x

Therefore, the total length of Nicole's drive is 40 miles.

The statement "The radius of a star can be indirectly determined if the star's distance and luminosity are known." is true because the radius of a star can be calculated using the Stefan-Boltzmann Law.

The Stefan-Boltzmann Law can be used to determine a star's radius. This law states that the luminosity of a star (the total amount of energy it emits in a given time) is proportional to the fourth power of its radius. Therefore, if the distance and luminosity of a star are known, its radius can be calculated by rearranging the equation.

This equation can be used to calculate the radius of a star even if its size cannot be directly measured. The equation is:

Radius = (L/4πσT⁴[tex])^{1/2}[/tex]

Where L is the luminosity of the star, σ is the Stefan-Boltzmann constant, and T is the temperature of the star.

To learn more about Stefan-Boltzmann Law link is here

brainly.com/question/30763196

#SPJ4

The five-number summary of the given data set is 2, 16.5, 54.5, 64.5, 70

To find the five-number summary of the given data set, we first need to order the data in ascending order:

2, 6, 7, 27, 46, 54, 55, 58, 61, 66, 69, 70

The five-number summary includes the minimum, first quartile (Q1), median (Q2), third quartile (Q3), and maximum of the data set.

Minimum: The smallest value in the data set is 2.

Q1 (First quartile): The median of the lower half of the data set, which includes the values up to and including the median. To find Q1, we take the median of the first half of the data set, which is:

2, 6, 7, 27, 46, 54

The median of this set is 16.5, which is the first quartile.

Q2 (Median): The median of the entire data set is:

2, 6, 7, 27, 46, 54, 55, 58, 61, 66, 69, 70

The median of this set is the average of the two middle values, which are 54 and 55. Therefore, the median is (54 + 55) / 2 = 54.5.

Q3 (Third quartile): The median of the upper half of the data set, which includes the values from the median to the maximum. To find Q3, we take the median of the second half of the data set, which is:

55, 58, 61, 66, 69, 70

The median of this set is 64.5, which is the third quartile.

Maximum: The largest value in the data set is 70.

Therefore, the five-number summary of the given data set is:

2, 16.5, 54.5, 64.5, 70

Learn more about data set

brainly.com/question/22210584

#SPJ11

The 5-point DFT of the sequence Y(k) is [15 -2.5 + 3.4j -2.5 + 0.81j -2.5 - 0.81j -2.5 - 3.4j]. So, the correct answer is 1).

We can find the 5-point DFT of y(n) using the formula

Y(k) = sum_{n=0}^{4} y(n) exp(-2piikn/5), k = 0,1,2,3,4

Substituting the values of y(n) = {1, 2, 3, 4, 5}, we get

Y(0) = 1 + 2 + 3 + 4 + 5 = 15

Y(1) = 1 + 2exp(-2pii/5) + 3exp(-4pii/5) + 4exp(-6pii/5) + 5exp(-8pii/5) = -2.5 + 3.4j

Y(2) = 1 + 2exp(-4pii/5) + 3exp(-8pii/5) + 4exp(-12pii/5) + 5exp(-16pii/5) = -2.5 + 0.81j

Y(3) = 1 + 2exp(-6pii/5) + 3exp(-12pii/5) + 4exp(-18pii/5) + 5exp(-24pii/5) = -2.5 - 0.81j

Y(4) = 1 + 2exp(-8pii/5) + 3exp(-16pii/5) + 4exp(-24pii/5) + 5exp(-32pii/5) = -2.5 - 3.4j

Therefore, the 5-point DFT of the sequence Y(k) is [15, -2.5 + 3.4j, -2.5 + 0.81j, -2.5 - 0.81j, -2.5 - 3.4j], which is option 1.

To know more about DFT:

https://brainly.com/question/31501117

#SPJ4

The general solution is y = y_h + y_p = c1 [tex]e^{ (-x) }[/tex] + c2 x e^(-x) - (1÷2) cos(x) - (1÷12) sin(2x) - (5÷24) cos(2x).

What is Differential Equation ?

A differential equation is a mathematical equation that relates a function or a set of functions with their derivatives or differentials. In other words, it is an equation that describes the behavior of a system in terms of the rates of change of one or more variables.

First, we find the homogeneous solution of the differential equation:

The characteristic equation is r*r + 2r + 1 = 0, which can be factored as (r+1)(r+1) = 0. Hence, the homogeneous solution is y_h = c1  [tex]e^{ (-x) }[/tex]  + c2 x[tex]e^{ (-x) }[/tex]

Now, we look for a particular solution of the form y_p = A sin(x) + B cos(x) + C sin(2x) + D cos(2x), where A, B, C, and D are constants to be determined.

Taking derivatives, we get y_p' = A cos(x) - B sin(x) + 2C cos(2x) - 2D sin(2x) and y_p'' = -A sin(x) - B cos(x) - 4C sin(2x) - 4D cos(2x).

Substituting y_p, y_p', and y_p'' into the differential equation, we get:

(-A sin(x) - B cos(x) - 4C sin(2x) - 4D cos(2x)) + 2(A cos(x) - B sin(x) + 2C cos(2x) - 2D sin(2x)) + (A sin(x) + B cos(x) + C sin(2x) + D cos(2x)) = sin(x) + 7cos(2x)

Simplifying and collecting like terms, we get:

(-3A - 3C + 4D) sin(2x) + (3B + 4C - 3D) cos(2x) + 2A cos(x) - 2B sin(x) = sin(x) + 7cos(2x)

Equating coefficients of sin(2x), cos(2x), sin(x), and cos(x), we get the following system of equations:

-3A - 3C + 4D = 0

3B + 4C - 3D = 7

2A = 0

-2B = 1

Solving for A, B, C, and D, we get:

A = 0

B = -1÷2

C = -1÷12

D = -5÷24

Therefore, the particular solution is y_p = (-1÷2) cos(x) - (1÷12) sin(2x) - (5÷24) cos(2x).

The general solution is y = y_h + y_p = c1   [tex]e^{ (-x) }[/tex] + c2 x  [tex]e^{ (-x) }[/tex] - (1÷2) cos(x) - (1÷12) sin(2x) - (5÷24) cos(2x).

To learn more about Differential Equation from given link.

https://brainly.com/question/14620493

#SPJ1

The expression that displays the break-even point as a constant or coefficient is: (x-3,000)² + 45,000, which is equivalent to 1,200 * (x-3,000)² - 9,000,000.

To find the break-even point, we need to set the profit function equal to 0 and solve for x:

P(x) = 2x² + 30x = 0

We can factor out x:

x(2x + 30) = 0

So, x = 0 or x = -15. Since we are looking for a positive number of units sold, the break-even point is:

x = 0 units

Now, we can plug this value into the given expressions to see which one results in a constant or coefficient:

((0-3,000)² - 9,000,000) = 0-9,000,000-9,000,000 = -18,000,000

(x-3,000)² + 45,000 = (0-3,000)² + 45,000 = 9,000,000 + 45,000 = 9,045,000

Therefore, the expression that displays the break-even point as a constant or coefficient is:

(x-3,000)² + 45,000, which is equivalent to 1,200 * (x-3,000)² - 9,000,000.

Learn more about break-even point at  https://brainly.com/question/15281855

#SPJ1

A the center of mass is[tex]$(x_{M},y_{M})=(0,2)$.[/tex] The answer is (a).
B the center of mass is [tex]$(x_{M},y_{M})=(\frac{2916}{7\cdot243},\frac{6561}{4\cdot243})$[/tex]. The answer is (a).

C the center of mass is[tex]$(x_{M},y_{M})=(0,2)$.[/tex] The answer is (a).

1A) We can find the mass by integrating the density function over the region:
[tex]$$M=\iint_{\Omega}\lambda(x,y)dA=\int_{0}^{5}\int_{0}^{25-x\sqrt{25-x^2}}2xydydx$$[/tex]
Evaluating this integral gives [tex]$M=\frac{625}{8}$.[/tex] To find the center of mass, we need to compute the moments:
[tex]$$M_{x}=\iint_{\Omega}x\lambda(x,y)dA=\int_{0}^{5}\int_{0}^{25-x\sqrt{25-x^2}}2x^2ydydx=\frac{8}{3}M$$\\$$M_{y}=\iint_{\Omega}y\lambda(x,y)dA=\int_{0}^{5}\int_{0}^{25-x\sqrt{25-x^2}}2xy^2dydx=\frac{8}{3}M$$[/tex]
So the center of mass is [tex]$(x_{M},y_{M})=(\frac{8}{3},\frac{8}{3})$[/tex]. Therefore, the answer is (a).

1B) Since the question only asks for the mass and center of mass, we can use the same method as in 1A to get [tex]$M=\int_{-1}^{1}\int_{0}^{4}x^2dydx=\frac{16}{3}$[/tex]. To find the moments, we have:
[tex]$$M_{x}=\int_{-1}^{1}\int_{0}^{4}x^3dydx=0$$\\$$M_{y}=\int_{-1}^{1}\int_{0}^{4}xy^2dydx=2\int_{0}^{1}\int_{0}^{4}xy^2dydx=\frac{16}{3}$$[/tex]
Therefore, the center of mass is[tex]$(x_{M},y_{M})=(0,2)$.[/tex] The answer is (a).

1C) Using the same method as in 1A, we have:
[tex]$$M=\int_{0}^{3}\int_{x^2}^{9}2xydydx=\frac{243}{2}$$[/tex]
To find the moments, we have:
[tex]$$M_{x}=\int_{0}^{3}\int_{x^2}^{9}x2xydydx=\frac{2916}{7}$$\\$$M_{y}=\int_{0}^{3}\int_{x^2}^{9}y2xydydx=\frac{6561}{4}$$[/tex]
Therefore, the center of mass is [tex]$(x_{M},y_{M})=(\frac{2916}{7\cdot243},\frac{6561}{4\cdot243})$[/tex]. The answer is (a).

learn more about center of mass,

https://brainly.com/question/28996108

#SPJ11

The function y =[tex](3/2) x^2[/tex] indeed satisfies the differential equation [tex]dy/dx = x 1.[/tex]

To check if [tex]y = 1/2 x^2 x 3[/tex]satisfies the differential equation dy/dx = x 1, we need to find the first derivative of y with respect to x and then compare it to the given dy/dx expression.

Given y = 1/2 x^2 x 3, we can rewrite it as[tex]y = (3/2) x^2.[/tex]

Now, let's find the first derivative of y with respect to x:

[tex]dy/dx = d(3/2 x^2)/dx = 3x[/tex]
Now we compare this with the given [tex]dy/dx = x 1. Since 3x = 3x * 1[/tex], the function y = (3/2) x^2 indeed satisfies the differential equation dy/dx = x 1.

To learn more about differential equation, refer below:

https://brainly.com/question/14620493

#SPJ11

Since it's going up and down, my guess would be the second answer slope = undefined.

Answer:

The Correct answer is slope=Undefined