Verify that y = -7t cos(t) - 7t is a solution of the following initial-value problem. dy = y + 7t2 sin(t) (TT) = 0 dt y = -7t cos(t) - 70 dy dt LHS = dy = 7t2 sin(t) - 7t cos(t) - 75 dt + y = RHS, so y is a solution of the differential equation. Also y(1) , so the initial condition satisfied.

The value x may be expressed as (a - b)(ab + b) / (ab - 1)(ab + 1).

To simplify the given expression x = (a² + b²) / (a b + 1), start by multiplying both the numerator and the denominator by (a b - 1) as follows:

x = (a² + b²)(a b - 1) / (a b + 1)(a b - 1)

Expanding the numerator using the distributive property:

x = (a² b - a² + a b² - b²) / (a² b - a b + a b² - 1)

Rearranging the terms in the numerator:

x = (a² b + a b² - a² - b²) / (a² b - a b + a b² - 1)

Factoring the numerator:

x = [(a² b - a b) + (a b² - b²)] / (a²b - a b + a b² - 1)

x = [a b (a - b) + b²(a - b)] / (a b - 1)(a b + 1)

x = (a - b)(a b + b) / (a b - 1)(a b + 1)

Therefore, the simplified expression for x is (a - b)(ab + b) / (ab - 1)(ab + 1).

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Therefore, the domain of f(x) = 2ˣ is: All real numbers And the range of f(x) = 2ˣ is: y > 0.

We must look for the set of all possible values of x that do not result in the function being undefined in order to determine the domain of the function y = f(x). The usual examples are taking the square root of negative integers, dividing by 0, etc.

The given exponential function is f(x) = 2ˣ.

The domain of an exponential function is all real numbers, since any real number can be raised to a power.

The range of the function is all positive real numbers, since 2 raised to any power will always be positive and approach zero as x approaches negative infinity.

Therefore, the domain of f(x) = 2ˣ is: All real numbers

And the range of f(x) =2ˣ is: y > 0

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The point Q after dilation with a scale factor of 1.5 about the point (0, -2) is (6, -2). So, correct option is C.

To find the new coordinates of point P after dilation with a scale factor of 1.5 about the point (0, -2), we can use the following formula:

Q(x, y) = S(x, y) = (1.5(x - 0) + 0, 1.5(y + 2) - 2)

Substituting the coordinates of point P (4, -2), we get:

Q(x, y) = S(4, -2) = (1.5(4 - 0) + 0, 1.5(-2 + 2) - 2)

Q(x, y) = S(4, -2) = (6, -2)

Therefore, the new point after dilation is Q(6, -2).

To check which of the given points A, B, C, and D match the new point Q, we can compare their coordinates. Only point C(6, -2) matches the new point Q, so that must be the answer. Points A, B, and D do not match the new point.

So, correct option is C.

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A basis for the set of vectors in R2 on the line y = 19x is {(1, 19)}.

To find a basis for the set of vectors in R2 on the line y = 19x, we need to find a vector that lies on the line and can represent any other vector on the line through scalar multiplication.

1. Choose a point on the line y = 19x. Let's choose the point (1, 19) since when x = 1, y = 19(1) = 19.
2. Create a vector from the origin to the chosen point. The vector would be v = (1, 19).
3. Verify that this vector lies on the line. The equation of the line is y = 19x, and our vector v = (1, 19) satisfies this equation since 19 = 19(1).

So, a basis for the set of vectors in R2 on the line y = 19x is {(1, 19)}. Any other vector on the line can be represented as a scalar multiple of this basis vector.

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Therefore, we need to prove the set of facts in option C: [tex]2^3 > 4^1, 3^3 > 4^2, and 4^3 > 4^3[/tex] (which is always true since any positive number raised to the power of 3 is greater than the same number raised to any power less than 3).

The theorem states that for any positive integer x less than 4, (x+1)³ > 4x.

To prove this theorem by exhaustion, we need to consider all possible values of x less than 4 and show that the inequality (x+1)³ > 4x holds for each of these values.

The possible values of x are 1, 2, and 3. Therefore, we need to prove the following three facts:

1³ > 4(0) (when x=1, the inequality becomes (1+1)³ > 4(1), which simplifies to 8 > 4, which is true)

2³ > 4(1) (when x=2, the inequality becomes (2+1)³ > 4(2), which simplifies to 27 > 8, which is true)

3³ > 4(2) (when x=3, the inequality becomes (3+1)³ > 4(3), which simplifies to 64 > 12, which is true)

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Answer:Since Tom and Kimberly are moving in opposite directions, they will cross paths at some point. Let's call the distance they will cover before they meet each other "x".

We can set up an equation to represent this:

x + (100 - x) = 100

Simplifying this equation, we get:

2x = 100 - x

Solving for x, we get:

x = 33.33 miles

This means that they will meet each other after traveling 33.33 miles from their respective homes. The time it takes to travel this distance can be calculated using the formula:

time = distance / speed

For Tom, the time taken to travel 33.33 miles at 65 mph is:

time = 33.33 / 65 = 0.5123 hours

Converting this to minutes, we get:

time = 0.5123 * 60 = 30.74 minutes

Similarly, for Kimberly, the time taken to travel 66.67 miles at 60 mph is:

time = 66.67 / 60 = 1.1111 hours

Converting this to minutes, we get:

time = 1.1111 * 60 = 66.67 minutes

Adding 20 minutes for loading and unloading at each home, the total time for each one-way trip is:

Tom: 30.74 + 20 + 20 = 70.74 minutes

Kimberly: 66.67 + 20 + 20 = 106.67 minutes

Since they are making five one-way trips, the total time for the move is:

Tom: 5 * 70.74 = 353.7 minutes

Kimberly: 5 * 106.67 = 533.35 minutes

To find out what time they will finish the move, we need to add the total time for the move to the time they started, which was 7 am. Let's convert the total time to hours:

Tom: 353.7 / 60 = 5.895 hours

Kimberly: 533.35 / 60 = 8.889 hours

Adding these times to 7 am, we get:

Tom: 7 am + 5.895 hours = 12:53 pm (rounded to the nearest minute)

Kimberly: 7 am + 8.889 hours = 3:53 pm (rounded to the nearest minute)

Therefore, they will finish the move at 12:53 pm and 3:53 pm, respectively.

Therefore, the general solution is:

y(x) = c₁e^(-2x)cos(√6x) + c₁e^(-2x)sin(√6x)

or

y(x) = c₁e^(-2x)(cos(√6x) + sin(√6x))

where c₁ is an arbitrary constant and x is the independent variable.

The given differential equation is y'' - y' + 5y' - 5y = 0. To find the general solution, we first find the characteristic equation:

r² - r + 5r - 5 = 0

Simplifying, we get:

r² + 4r - 5 = 0

Using the quadratic formula, we get:

r = (-4 ± √(4² + 4(1)(5))) / 2
r = (-4 ± √36) / 2
r₁ = -2 - √6, r₂ = -2 + √6

Therefore, the general solution is:

y(x) = c₁e^(r₁x) + c₂e^(r₂x)

Substituting the values of r₁ and r₂, we get:

y(x) = c₁e^(-2-√6)x + c₂e^(-2+√6)x

Simplifying, we get:

y(x) = c₁e^(-2x)e^(-√6x) + c₂e^(-2x)e^(√6x)

Using Euler's formula, we can simplify further:

y(x) = c₁e^(-2x)(cos(√6x) - i sin(√6x)) + c₂e^(-2x)(cos(√6x) + i sin(√6x))

Separating the real and imaginary parts, we get:

y(x) = c₁e^(-2x)cos(√6x) + c₂e^(-2x)cos(√6x) + i(c₁e^(-2x)sin(√6x) - c₂e^(-2x)sin(√6x))

Since the differential equation is real-valued, the imaginary part must be zero. Therefore, we have:

c₁e^(-2x)sin(√6x) = c₂e^(-2x)sin(√6x)

Since sin(√6x) cannot be zero for all x, we must have:

c₁ = c₂ = c₃

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The equation representing the new price with the 28% markup is y = 1.28p.

The equation that represents the new price of a bag, y, given an original price, p, with a markup rate of 28% is:

y = 1.28p

This equation is derived as follows:

Convert the markup rate to a decimal by dividing by 100:

28% / 100 = 0.28

Add 1 to the decimal markup rate:

1 + 0.28 = 1.28

Multiply the original price by the result:

y = p × 1.28

So, the equation representing the new price with the 28% markup is y = 1.28p.

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Answer:

100%

Step-by-step explanation:

There are 8 equally probable outcomes on the spinner, numbered from 1 to 8. Of these, the even numbers are 2, 4, 6, and there are 6 numbers less than 7, namely 1, 2, 3, 4, 5, 6.

To find the probability of the pointer stopping on an even number or a number less than 7, we need to add the probabilities of these two events occurring and subtract the probability of both events occurring at the same time, since this would lead to double counting:

P(even or less than 7) = P(even) + P(less than 7) - P(even and less than 7)

P(even) = 3/8, since there are 3 even numbers on the spinner out of 8 total outcomes.

P(less than 7) = 6/8, since there are 6 numbers less than 7 on the spinner out of 8 total outcomes.

P(even and less than 7) = 1/8, since only 4 satisfies both conditions (even and less than 7) out of 8 total outcomes.

Therefore, substituting these values, we get:

P(even or less than 7) = 3/8 + 6/8 - 1/8

P(even or less than 7) = 8/8 = 1

So the probability that the pointer will stop on an even number or a number less than 7 is 1 or 100%.

Hope this helps!

Answer: d x+2x+2x=36

Step-by-step explanation:

The dial's radius is approximately 13.99 millimeters.

The circumference of a circle is given by the formula:

C = 2πr

where C is the circumference, π is the constant pi (approximately equal to 3.14159), and r is the radius of the circle.

The circumference C in this instance is 87.92 millimeters. We can adjust the equation to address for the sweep:

r = C / 2π

Substituting the given value for C, we get:

r = 87.92 mm / (2π)

r ≈ 13.99 mm

As a result, the dial has a radius of about 13.99 millimeters.

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z-score for Stimulus 2 (-2.33) is more negative than the z-score for Stimulus 1 (-1.29), you are reacting relatively more quickly to Stimulus 2 compared to other individuals.

We need to calculate the z-scores for your reaction times for each stimulus.

For Stimulus 1:

z-score = (your reaction time - mean reaction time for Stimulus 1) / standard deviation for Stimulus 1

z-score = (4.2 - 6.0) / 1.4

z-score = -1.29

For Stimulus 2:

z-score = (your reaction time - mean reaction time for Stimulus 2) / standard deviation for Stimulus 2

z-score = (1.8 - 3.2) / 0.6

z-score = -2.33

The more negative the z-score, the farther away your reaction time is from the mean.

Therefore, since the z-score for Stimulus 2 (-2.33) is more negative than the z-score for Stimulus 1 (-1.29), you are reacting relatively more quickly to Stimulus 2 compared to other individuals.

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Answer:

D has the following vertices

The solid described by the given inequalities in spherical coordinates is a spherical cap. It is bounded by the spherical coordinates (2, 0, π), (2, π/4, π), (3, 0, 2π), and (3, π/4, 2π). The spherical cap can be visualized by connecting these points and plotting the points inside the boundaries.

Coordinates are the set of two or three numbers used to locate a point in space, in a two-dimensional plane or in a three-dimensional space. Coordinates are usually expressed as either latitude and longitude, or as x-y-z values. Coordinates are used to plot the location of points of interest on a map, or to plot the path of an object in motion.

This solid can be sketched as a spherical cap in spherical coordinates. The spherical cap is a portion of a sphere that is cut off by a plane. The boundary of the spherical cap is described by the inequalities given.

The spherical coordinates are defined by three parameters: rho, phi, and theta. The parameter rho is the radial distance from the origin, phi is the angle measured in the xy-plane from the positive x-axis, and theta is the angle measured from the positive z-axis.

In this case, the spherical cap is bounded by the inequalities 2 ≤ rho ≤ 3, 0 ≤ phi ≤ π/4, and π ≤ θ ≤ 2π. The spherical cap is defined as the portion of the sphere that lies between the two planes defined by these inequalities.

The solid is bounded by the following spherical coordinates: (2, 0, π), (2, π/4, π), (3, 0, 2π), and (3, π/4, 2π). The solid can be sketched by connecting these points and plotting the points inside the boundaries.

The spherical cap is a portion of a sphere that is bounded by two planes. The two planes intersect at the boundary of the solid, which is described by the inequalities given. The spherical cap is a portion of the sphere that is cut off by the planes and is bounded by the spherical coordinates given.

In conclusion, the solid described by the given inequalities in spherical coordinates is a spherical cap. It is bounded by the spherical coordinates (2, 0, π), (2, π/4, π), (3, 0, 2π), and (3, π/4, 2π). The spherical cap can be visualized by connecting these points and plotting the points inside the boundaries.

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The probability that we reject 0 when it is true is equal to the chosen significance level (α).

The probability that we reject 0 when, in fact, 0 is true is known as the Type I error rate, or the false positive rate. In hypothesis testing, this probability is represented by the significance level, which is denoted by the Greek letter alpha (α). The significance level is a predetermined threshold, typically set at 0.05 or 5%. If the calculated p-value is less than the significance level (α), we reject the null hypothesis (0) even if it is true. So, the probability that we reject 0 when it is true is equal to the chosen significance level (α).

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No, it is not possible that CA = I4 for some 4 × 2 matrix C, where A is a 4 × 2 matrix and I4 is the 4 × 4 identity matrix.



1. Recall that the identity matrix I4 is a 4 × 4 matrix with ones on the diagonal and zeros elsewhere.

2. In matrix multiplication, the number of columns in the first matrix must equal the number of rows in the second matrix.

3. If C is a 4 × 2 matrix and A is a 4 × 2 matrix, then matrix multiplication CA results in a 4 × 2 matrix, as the number of rows in C (4) and the number of columns in A (2) determine the dimensions of the resulting matrix.

4. Since CA produces a 4 × 2 matrix, it cannot be equal to the 4 × 4 identity matrix I4, as the dimensions are not the same.

Therefore, it is not possible for CA = I4 for some 4 × 2 matrix C.

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The length of the third side of this isosceles triangle is 2 units.

We have,

If two sides of an isosceles triangle are equal, then the third side must also be equal in length.

So,

If two sides of the triangle are 2 and 2, the length of the third side must also be 2.

Thus,

The length of the third side of this isosceles triangle is 2 units.

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Hi! Based on the information provided, using homework 10 data with a significance level (α) of 0.05 and a p-value of 0.038, your conclusion is that you would reject the null hypothesis.

This is because the p-value (0.038) is less than the significance level (0.05), indicating that there is significant evidence to suggest that the alternative hypothesis is true. Therefore, the conclusion is made based on the evidence to suggest that there is a statistically significant difference between the groups being compared in the study analyzed in homework 10.

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Answer:

x² + y² = 80

Step-by-step explanation:

We are given that a circle has the center at the origin (the point (0,0)) and passes through the point (-8,4).

We want to write the equation of this circle in the standard equation. The standard equation is (x-h)² + (y-k)² = r² where (h,k) is the center and r is the radius.

As we are given the center, we can plug its values into the equation.

Substitute 0 as h and 0 as k.

(x-0)² + (y-0)² = r²

This becomes:

x² + y² = r²

Now, we need to find r².

As the circle passes through (-8,4), we can use its values to help solve for r².

Substitute -8 as x and 4 as y.

(-8)² + (4)² = r²

64 + 16 = r²

80 = r²

Substitute 80 as r².

x² + y² = 80

Answer:

The probability of the 4th donation being Type O or Type B is:

P(Type O or B) = P(Type O) + P(Type B) = 0.49 + 0.20 = 0.69

The probability of the 4th donation being safe for someone with Type B blood is the probability that it is Type O or Type B, which is 0.69. Therefore, the probability that the 4th donation selected at random can be safely used in a blood transfusion on someone with Type B blood is:

P(safe for Type B) = 0.69

Answer: (0.69)³(0.31)

Each graph identified above are described below.

For the fundamental function h(x) = 2x:

f(x) = -h(  x) represents te x-axis graph of h(x). When C   is greater than 0, the f(x ) graph is always below the x-axis and approaches 0 as x approaches negative infinity. The graph of f( x) approaches negative infinity as x approaches positive infinity.

As a result, for C > 0, the f(x) graph is always declining and concave down.

g( x) = h(x - 0) moves the h(x) graph to the right by 0 units. When C is 0, the g(x) graph is always above the x-axis and approaches 0 as x approaches positive infinity. The graph of g( x) approaches positive infinity as x approaches negative infinity.

As a result, for C 0, the g(x) graph is constantly growing and concave up.

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We cannot definitively determine whether the interval (27.336, 33.064) covers the true mean based on the information provided. However, we can say that there is a 97% probability that the true mean falls within this interval. This is because the given interval is a 97% confidence interval, which means that if we were to take repeated samples of 97 students from the same population and construct 97% confidence intervals for each sample, approximately 97% of these intervals would contain the true mean.

Therefore, we cannot say for certain whether the true mean is within the given interval, but we can be highly confident that it is. Additionally, we should keep in mind that the College Board only analyzed a sample of 97 students, so there is some uncertainty and potential for sampling error in the estimation of the true mean.

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Answer:

52.7 g

Step-by-step explanation:

We are given;

Initial mass of the element is 310 g

Rate of decay 8.9% per minute

Time for the decay 19 minutes

We are required to determine the amount of the element that will remain after 19 minutes.

We can use the formula;

New mass = Original mass × (1-r)^n

Where n is the time taken and r is the rate of decay.

Therefore;

Remaining mass = 310 g × (1-0.089)^19

                           = 52.748 g

                           = 52.7 g (to the nearest 10th)

Thus, the mass that will remain after 9 minutes will be 52.7 g

The amount of fencing, dirt and sod for the baseball field are: length of Fencing & 1410.5 ft. Area of the sod ≈ 118017.13ft² Area of the field covered with distance ≈ 7049.6ft²

Area of a circle = πr²

Circumference of a circle = 2πr

where r is the radius of the circle

The area of a Quarter of a circle is therefore;

Area of a circle/ 4

The perimeter of a Quarter of a Circle is;

The perimeter of a circle/4

Fencing = ¼ x 2 x π x 380 + 2 x 15 +2 x 380 + ¼ x 2 x π x 15

Fencing = 197.5π + 190π = 1410.5 feet.

Grass =

π/4 x (380 - 6)² + 87 ² - π/4 × (87 + 30)² + 2 x 380 x 15 + π/4 x 15² - (3/4) x π x 10² - 25π

= 31528π + 18969 = 118017.13

The area Covered by the sod is about 118017.13Sq ft.

Dirt = π/4 x 380 ² - π/4 x (380 - 6)² + π/4 (87 + 30)² - 87² + π100 = (18613π - 30276)/4

= 7049.6

Therefore, the area occupied by the dirt is about 7049.6 Sq ft.

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The probability of not landing on a yellow section when spinning the spinner once is 75%.

Option A is correct

The spinner has eight sections, two of which are yellow. Therefore, the probability of landing on a yellow section is:

P(yellow) = 2/8 = 1/4 = 0.25

To determine the probability of not landing on a yellow section, we can use the complement rule:

P(not yellow) = 1 - P(yellow)

P(not yellow) = 1 - 0.25

P(not yellow) = 0.75 or 75%

Therefore, the probability of not landing on a yellow section when spinning the spinner once is 75%.

Option A is correct

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The pdf of x is f(x) = (x^4 * e^(-x/3)) / 1620.

the variance of x is var[x] = 45.

(a) Since x is an Erlang (n, λ) random variable with expected value e[x] = 15 and λ = 1/3, we have:

e[x] = n/λ = n/(1/3) = 3n

Therefore, we have:

3n = 15

n = 5

So the value of the parameter n is 5.

(b) The probability density function (pdf) of an Erlang (n, λ) random variable is given by:

f(x) = (λ^n * x^(n-1) * e^(-λx)) / (n-1)!

Substituting λ = 1/3 and n = 5, we have:

f(x) = (1/3)^5 * x^4 * e^(-x/3) / 4!

        = (x^4 * e^(-x/3)) / 1620

Therefore, the pdf of x is f(x) = (x^4 * e^(-x/3)) / 1620.

(c) The variance of an Erlang (n, λ) random variable is given by:

var[x] = n/λ^2 = n/(1/λ)^2

Substituting λ = 1/3 and n = 5, we have:

var[x] = 5/(1/(1/3))^2

        = 45

Therefore, the variance of x is var[x] = 45.

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Answer:

5 %

Step-by-step explanation:

We can define the vector field as:F(x,y) = v = ⟨−y,x⟩/√(x²+y²).

This vector field satisfies the conditions that all vectors have length 1 and are perpendicular to the position vector at each point

Perpendicular lines are lines that intersect at a right angle (90 degrees).

Let's consider a two-dimensional vector field, denoted by F(x,y), where F is a vector function of two variables x and y. We want all vectors in this field to have length 1 and to be perpendicular to the position vector at each point.

The position vector at a point (x,y) is given by r = x, y , so we need to find a vector that is perpendicular to r and has length 1. One such vector is \ -y, x .

To make sure that all vectors in the field have length 1, we can normalize this vector by dividing it by its magnitude:

v = ⟨−y,x⟩/√(x²+y²).

Finally, we can define the vector field as:

F(x,y) = v = ⟨−y,x⟩/√(x²+y²).

This vector field satisfies the conditions that all vectors have length 1 and are perpendicular to the position vector at each point.

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We can define the vector field as:F(x,y) = v = ⟨−y,x⟩/√(x²+y²).

This vector field satisfies the conditions that all vectors have length 1 and are perpendicular to the position vector at each point

Perpendicular lines are lines that intersect at a right angle (90 degrees).

Let's consider a two-dimensional vector field, denoted by F(x,y), where F is a vector function of two variables x and y. We want all vectors in this field to have length 1 and to be perpendicular to the position vector at each point.

The position vector at a point (x,y) is given by r = x, y , so we need to find a vector that is perpendicular to r and has length 1. One such vector is \ -y, x .

To make sure that all vectors in the field have length 1, we can normalize this vector by dividing it by its magnitude:

v = ⟨−y,x⟩/√(x²+y²).

Finally, we can define the vector field as:

F(x,y) = v = ⟨−y,x⟩/√(x²+y²).

This vector field satisfies the conditions that all vectors have length 1 and are perpendicular to the position vector at each point.

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The lateral surface area of the cone is 20π square units.

To find the lateral surface area of a right circular cone generated by revolving the region bounded by y = 3x/4, y = 3, and x = 0 about the y-axis, we need to follow these steps,

1. Find the height and slant height of the cone.
2. Use the formula for the lateral surface area of a cone: LSA = πr * l, where r is the radius and l is the slant height.

Find the height and slant height of the cone.
The equation of the line is y = 3x/4. We are given that y = 3, so we can solve for x:
3 = 3x/4
x = 4

Thus, the height (h) of the cone is 3, and the base radius (r) is 4. To find the slant height (l), we can use the Pythagorean theorem:
l² = h² + r²
l² = 3² + 4²
l² = 9 + 16
l² = 25
l = 5

Use the formula for the lateral surface area of a cone.
LSA = πr * l
LSA = π(4) * (5)
LSA = 20π

The lateral surface area of the cone is 20π square units.

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Answer:

X = 24.4

Step-by-step explanation:

for the triangle we use sin b/c it contain both hyp and opposite so

sin(35°) = 14/x

sin(35) × X = 14

X = 14 / (sin(35)

X = 24.4 ... it is the answer of hypotenus of the

triangle

Answer:

Step-by-step explanation: