answer please, ill give brainliestt!!

The rate of change of the area at the instant when the radius is 20 ft is -160π square feet per minute.

The area of a circle is given by the formula A = π [tex]r^2[/tex], where r is the radius of the circle.

We are given that the radius of the circle is decreasing at a rate of 4 ft/min. This means that the rate of change of the radius with respect to time is -4 ft/min (negative because the radius is decreasing).

At the instant when the radius is 20 ft, we can calculate the rate of change of the area by taking the derivative of the area formula with respect to time:

dA/dt = d/dt (π[tex]r^2)[/tex]

Using the chain rule, we get:

dA/dt = 2πr (dr/dt)

Substituting r = 20 ft and dr/dt = -4 ft/min, we get:

dA/dt = 2π(20)(-4) = -160π

Therefore, the rate of change of the area at the instant when the radius is 20 ft is -160π square feet per minute.

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Answer:

9÷ 1/2 = 9 • 2/1 = 18 bags of trail mix

Step-by-step explanation:

You can solve this problem using division.  Since there are 9 pounds of trail mix to divide up, you would start with 9 pounds and divide it by 1/2 pound to find the number of bags you could make (use the reciprocal of the divisor 1/2)

The value of angle C in degrees is 20.0°

A triangle is a closed, 2-dimensional shape with 3 sides, 3 angles, and 3 vertices. A triangle is also a polygon. There are different types of triangle, examples are; Scalene triangle, isosceles triangle, equilateral triangle e.t.c

A triangular theorem states that the sum of angle In a triangle is 180°. This means that , if A,B,C are the angle in a triangle, then A+B+C = 180°

This means that ;

40+120+C = 180°

160+C = 180°

collecting like terms

C = 180- 160

C = 20.0°( nearest tenth)

therefore the value of angle C is 20.0°

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Answer:

The answer is 5ft

Step-by-step explanation:

A=L×B

A=L×W

30=6×W

30=6W

divide both sides by 6

W=5ft

The matrix representing L with respect to the ordered bases E is [ 0 5 3l ][ -2 l -3l ]. The matrix representing L with respect to the ordered bases F is [ 1 l -l/2 ] [ -1 1 3/2 ].

To find the matrix representing the linear transformation L with respect to the ordered bases E and F, we need to determine where L sends each vector in the basis E and express the results as linear combinations of the basis vectors in F. We can then arrange the coefficients of these linear combinations in a matrix.

Let's apply this approach to each of the given linear transformations:

L(x, y, z) = (x + y, z)

To find the image of u1 = (1, 0, -1)T under L, we compute L(u1) = (1 + 0, -1) = (1, -1). Similarly, we can compute L(u2) = (3, l) and L(u3) = (-l, 3l). Now we express each of these images as a linear combination of the vectors in F:

L(u1) = 1*b1 + (-1/2)b2

L(u2) = lb1 + (1/2)*b2

L(u3) = (-l/2)*b1 + (3/2)*b2

These coefficients give us the matrix:

[ 1 l -l/2 ]

[ -1 1 3/2 ]

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

Using the same process, we find:

L(u1) = (0, -2)

L(u2) = (5, l)

L(u3) = (3l, -3l)

Expressing these images in terms of E gives the matrix:

[ 0 5 3l ]

[ -2 l -3l ]

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The matrix A of the rotation about the y-axis through an angle of π/2 clockwise as viewed from the positive y-axis is [tex]A=\left[\begin{array}{ccc}0 & 0 & -1 \\0 & 1 & 0 \\1 & 0 & 0\end{array}\right][/tex].

In mathematics, a matrix is a rectangular array or table of numbers, symbols, or expressions, arranged in rows and columns, which is used to represent a mathematical object or a property of such an object.

To find the matrix A of the rotation about the y-axis through an angle of π/2 (90 degrees) clockwise as viewed from the positive y-axis, we can use the following rotation matrix:

[tex]A=\left[\begin{array}{ccc}\cos (\theta) & 0 & -\sin (\theta) \\0 & 1 & 0 \\\sin (\theta) & 0 & \cos (\theta)\end{array}\right][/tex]

Substitute θ with π/2, which is the angle of rotation.

[tex]A=\left[\begin{array}{ccc}\cos \left(\frac{\pi}{2}\right) & 0 & -\sin \left(\frac{\pi}{2}\right) \\0 & 1 & 0 \\\sin \left(\frac{\pi}{2}\right) & 0 & \cos \left(\frac{\pi}{2}\right)\end{array}\right][/tex]

Compute the trigonometric values for cos( π/2) and sin( π/2).

cos( π/2) = 0
sin( π/2) = 1

Substitute the computed values back into the matrix.

[tex]A=\left[\begin{array}{ccc}0 & 0 & -1 \\0 & 1 & 0 \\1 & 0 & 0\end{array}\right][/tex]

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In economics, a utility function is a mathematical function that assigns a numerical value to the satisfaction or utility that a consumer derives from consuming a particular combination of goods and services.

First, let's correct the utility function you provided. I believe it should be:
u(x1, x2) = x1^2 + x2^2

Now, let's find the marginal utility functions with respect to x1 and x2. The marginal utility is the derivative of the utility function with respect to the corresponding variable.

(a) Marginal utility function with respect to x1:
MU_x1 = d(u(x1, x2))/dx1 = 2x1

Marginal utility function with respect to x2:
MU_x2 = d(u(x1, x2))/dx2 = 2x2

(b) The significance of this utility function is that it exhibits diminishing marginal utility for both x1 and x2. As the consumption of x1 or x2 increases, the additional utility gained from consuming more units of x1 or x2 decreases.

This is evident in the marginal utility functions MU_x1 and MU_x2, where the derivatives are constant values (2x1 and 2x2), indicating a linear relationship.

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Answer:

90 or 270

Step-by-step explanation:

To determine the bearing of the tree from the student, we need to use the reference direction of North. Typically, bearings are measured in degrees clockwise from North.

If the student stands 15 meters away directly west of the tree, then we can draw a line connecting the student and the tree, which would be a line going directly east to west.

Since we want to find the bearing of the tree from the student, we need to measure the angle between the line connecting the student and the tree and the North direction. Since the line between the student and the tree is going directly east to west, this angle will be either 90 degrees or 270 degrees, depending on which direction we consider as North.

If we consider North to be directly above the student, then the bearing of the tree from the student would be 90 degrees, since the line connecting the student and the tree is perpendicular to the North direction.

If we consider North to be directly below the student, then the bearing of the tree from the student would be 270 degrees, since the line connecting the student and the tree is perpendicular to the South direction (which is opposite to North).

Therefore, depending on the reference direction of North that we choose, the tree's bearing from the student will be either 90 degrees or 270 degrees.

The distance that is being travelled by the flying squirrel in total would be = 18.2m.

To calculate the distance covered by the squirrel, the Pythagorean formula should be used. That is;

C² = a² + b²

a = 8m

b = 2m

c²= 8² + 2²

= 64+4

c = √68

= 8.2m

The total distance travelled by the flying squirrel is to find the perimeter of the triangle covered by the squirrel.

perimeter = length+width+height

= 8+2+8.2 = 18.2m.

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Therefore, the complete homogeneous system solution is: x = [-0.1765, 0.6471, -0.0882] + t1[2, -1, 1] + t2[0, -1, 1]

The system, first we need to find the inverse of matrix A, which is:

A = [3 7 6]

[-3 11 2]

[4 0 -6]

det(A) = 3*(-611 - 20) - 7*(-3*-6) + 6*(-3*2) = -204

adj(A) = [72 18 42]

[54 6 33]

[14 28 14]

[tex]A^{(-1) }= adj(A)/det(A):[/tex]

[-0.3529 0.0882 -0.2059]

[-0.2647 -0.0294 -0.1618]

[-0.0686 -0.1373 -0.0686]

Next, we need to solve for Xp using Xp = [tex]A^{(-1)} * b:[/tex]

b = [1 2 2]

Xp = [tex]A^{(-1)} * b:[/tex]= [-0.1765, 0.6471, -0.0882]

To find Xn, we solve the associated homogeneous system Ax = 0:

[3 7 6][x1] [0]

[-3 11 2][x2] = [0]

[4 0 -6][x3] [0]

Writing this system in augmented form, we have:

[3 7 6 | 0]

[-3 11 2 | 0]

[4 0 -6 | 0]

We can use row reduction to solve for the reduced row echelon form:

[1 0 -2 | 0]

[0 1 1 | 0]

[0 0 0 | 0]

The general solution can be written as:

x = t1[2, -1, 1] + t2[0, -1, 1]

Here t1 and t2 are arbitrary constants.

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Correct Question:

Find the complete solution x= Xp + xn of the system Ax = b, A= b where 3 7 6 -3 11 2 4 0 -6 Xp stands for a particular solution and Xn the general solution of the associated homogeneous system. {1 2 3 3 10 2 2 -2 2 2 . }

The given summation can be expanded as a series of terms, where each term is the product of two factors: one factor consists of the index variable, i or k+1, and the factorial i! or (k+1)!. The other factor consists of the sum of the first i or k terms of the corresponding factorial sequence, i.e., 1(1!), 2(2!), 3(3!), and so on.

Because i in the first term runs from 1 to k, the total is made up of the first k terms of the i! sequence multiplied by the appropriate value of i. Because k is the sole index variable in the second term, the total is composed of the first k terms of the k! sequence multiplied by each matching value of k.

The following terms have i ranging from k+1 to the summation's ultimate value, and the total is made up of the first i-1 terms of the i! sequence multiplied by each corresponding value of i. The first component, (k+1)!, accounts for the terms not included in the first two terms in the prior summations.

Overall, the summation represents a combination of factorials and their corresponding sum sequences, with the index variables determining the range of terms to include in each sum.

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This is an exercise of the Pythagorean Theorem, which establishes that in every right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides, called legs.

This can be expressed mathematically as:

Where "a" and "b" are the lengths of the legs and "c" is the length of the hypotenuse. This theorem is one of the fundamental bases of geometry and has many applications in physics, engineering, and other areas of science.

The Pythagorean Theorem formula is used to calculate the length of an unknown side of a right triangle, as long as the lengths of the other two sides are known. It can also be used to determine if a triangle is right if the lengths of its sides are known.

To calculate the hypotenuse, we will apply the formula:

c = √(a² + b²)

Knowing that:

a = 8cm

b = 15cm

Now we just substitute the data in the formula, and calculate the hypotenuse, then

The hypotenuse C of the triangle is 17 cm.

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Therefore, H(t) is increasing on the intervals (-∞, -1/[tex]\sqrt7[/tex]) and ([tex]1/\sqrt7[/tex], ∞) and decreasing on the interval ([tex]-1/\sqrt7[/tex], [tex]1/\sqrt7[/tex]).and There are no local or absolute maximum values for H(t).

To find the intervals on which the function H(t) is increasing or decreasing, we need to take the first derivative of H(t) and find its critical points.

a.) First derivative of H(t):

[tex]H'(t) = 12t^11 - 84/7t^13[/tex]

[tex]= 12t^11(1 - 7t^2)/7t^2[/tex]

The critical points are where H'(t) = 0 or H'(t) is undefined.

So, setting H'(t) = 0, we get:

[tex]12t^11(1 - 7t^2)/7t^2 = 0[/tex]

[tex]t = 0[/tex] or t = ±([tex]1/\sqrt7[/tex])

H'(t) is undefined at t = 0.

Now, we can use the first derivative test to determine the intervals on which H(t) is increasing or decreasing. We can do this by choosing test points between the critical points and checking whether the derivative is positive or negative at those points.

Test point: -1

[tex]H'(-1) = 12(-1)^11(1 - 7(-1)^2)/7(-1)^2 = -12/7 < 0[/tex]

Test point: (-1/√7)

[tex]H'(-1/\sqrt7) = 12(-1/\sqrt7)^11(1 - 7(-1/\sqrt7)^2)/7(-1/\sqrt7)^2 = 12/7\sqrt7 > 0[/tex]

Test point: (1/√7)

[tex]H'(1/\sqrt7) = 12(1/\sqrt7)^11(1 - 7(1/\sqrt7)^2)/7(1/\sqrt7)^2 = -12/7\sqrt7 < 0[/tex]

Test point: 1

[tex]H'(1) = 12(1)^11(1 - 7(1)^2)/7(1)^2 = 5/7 > 0[/tex]

Therefore, H(t) is increasing on the intervals (-∞, -1/√7) and (1/√7, ∞) and decreasing on the interval (-1/√7, 1/√7).

b.) To find the local and absolute extreme values of H(t), we need to check the critical points and the endpoints of the intervals.

Critical points:

[tex]H(-1/\sqrt7) \approx -0.3497[/tex]

[tex]H(0) = 0[/tex]

[tex]H(1/\sqrt7) \approx-0.3497[/tex]

Endpoints:

H (-∞) = -∞

H (∞) = ∞

Since H (-∞) is negative and H (∞) is positive, there must be a global minimum at some point between -1/√7 and 1/√7. The function is symmetric about the y-axis, so the global minimum occurs at t = 0, which is also a local minimum. Therefore, the absolute minimum of H(t) is 0, which occurs at t = 0.

There are no local or absolute maximum values for H(t).

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The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is approximately 0.0932.

To find the margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones, we can use the formula:

Margin of Error = Z* * sqrt(p*(1-p)/n)

where:
Z* is the z-score corresponding to the desired level of confidence (in this case, 1.96 for 95% confidence)
p is the sample proportion (55/75 = 0.7333)
n is the sample size (75)

Plugging in the values, we get:

Margin of Error = 1.96 * sqrt(0.7333*(1-0.7333)/75)
Margin of Error ≈ 0.0932

Therefore, the margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is approximately 0.0932.

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As x approaches to  0, x²/8 approaches 0 the limit is 1/2 and the taylor polynomial for cos(x), for x near 0 is  (x²/2 - x⁴/24)/x

To find the Taylor polynomial of degree 4 for cos(x) near x = 0, we use the following formula:

p4(x) = cos(0) - (x²/2!) + (x⁴/4!) = 1 - (x²/2) + (x⁴/24)

To simplify the ratio (1-cos(x))/x, we substitute cos(x) with p4(x):

(1 - (1 - (x²/2) + (x⁴/24)))/x = (x²/2 - x⁴/24)/x

Now, to find the limit as x approaches 0:

lim (x->0) (x²/2 - x⁴/24)/x = lim (x->0) (x/2 - x³/24)

Using L'Hopital's rule, we differentiate the numerator and the denominator with respect to x:

lim (x->0) (1/2 - x²/8)

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In this case, we can use a standard normal distribution table or a calculator to find that the value for P75 is approximately 12.1.

Here is a normal bell curve for a normal distribution with mean (μ) of 8 and standard deviation (σ) of 5:

The horizontal axis represents the range of possible values for the variable X, and the vertical axis represents the probability density of each value occurring.

The curve is symmetrical around the mean (μ=8), which is located at the peak of the curve. The standard deviation (σ=5) determines the width of the curve, with wider curves having larger standard deviations.

The shaded area under the curve represents the probability of a value falling within a certain range. For example, the area under the curve between X=3 and X=13 represents the probability of a value falling within 1 standard deviation of the mean, which is approximately 68%.

The percentile of a certain value can also be determined from the normal distribution. For example, the 75th percentile (represented as P75) is the value that separates the lowest 75% of values from the highest 25%. In this case, we can use a standard normal distribution table or a calculator to find that the value for P75 is approximately 12.1.

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Therefore, based on the information given, it seems that Bus Company A is doing slightly better in terms of on-time performance.

To determine which bus company seems to be doing better, we need to compare their on-time performance.

Bus Company A claims that it is typically on time 95% of the time. This means that out of 100 trips, it expects to be on time for 95 of them.

On the other hand, Bus Company B has a record of being on time 47 days out of the 50 days that it operates. This means that its on-time performance is:

47/50 = 0.94 or 94%

Comparing the two percentages,

we can see that Bus Company A claims to have a higher on-time performance (95%) than Bus Company B's actual on-time performance (94%).  Bus Company B's on-time performance is based on actual data from 50 days of operation.

Therefore, based on the information given, it seems that Bus Company A is doing slightly better in terms of on-time performance.

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Complete question:

Bus Company A claims that it is typically on time 95% of the time While Bus

Company B has a record of being on time 47 days out of the 50 days that it

operates. Which bus company seems to be doing better?

Yes, this is a valid confidence interval calculation for comparing the proportions of snowy days in Denver and Chicago.

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To show that if ab = ac and a is nonsingular, then the cancellation law holds, meaning b = c, we can follow these steps:

1. Start with the given equation: ab = ac.
2. We know that a is nonsingular, which means it has an inverse, denoted by a^(-1).
3. Multiply both sides of the equation by the inverse of a on the left: a^(-1)(ab) = a^(-1)(ac).
4. Use the associative property of matrix multiplication: (a^(-1)a)b = (a^(-1)a)c.
5. The product of a matrix and its inverse is the identity matrix (I): Ib = Ic.
6. The identity matrix doesn't change the matrix when multiplied: b = c.

Thus, by using the given terms "nonsingular," "cancellation law," and "b = c," we have shown that if ab = ac and a is nonsingular, then the cancellation law holds, and b = c.

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The general solution of the differential equation will be in the form: y(t) =[tex]C1 * e^(r1 * t) + C2 * e^(r2 * t) + C3 * e^(r3 * t) + C4 * e^(r4 * t) + C5 * e^(r5 * t),[/tex] where C1, C2, C3, C4, and C5 are arbitrary constants.

To find the general solution of the differential equation, we first need to find the characteristic equation by assuming a solution of the form y(t) = e^(rt). Plugging this into the differential equation, we get:

[tex]r^5 - 7r^4 + 13r^3 - 7r^2 + 12r = 0[/tex]

Factoring out an r term, we can simplify this to:

[tex]r(r^4 - 7r^3 + 13r^2 - 7r + 12) = 0[/tex]

We can solve for the roots of the polynomial using either factoring or the quadratic formula, but it turns out that there is only one real root, r = 1, with a multiplicity of 3, and two complex conjugate roots, r = 1 ± i. Therefore, the general solution is:

[tex]y(t) = C1 e^t + (C2 + C3 t + C4 t^2) e^(1+i)t + (C2 - C3 t + C4 t^2) e^(1-i)t + C5[/tex]

where C1, C2, C3, C4, and C5 are arbitrary constants to be determined by initial or boundary conditions. The last term, C5, represents the general solution to the homogeneous differential equation, since it contains no terms involving the roots of the characteristic equation.
To find the general solution of the given differential equation y(5) - 7y(4) + 13y'' - 7y' + 12y = 0, we first need to find the characteristic equation. The characteristic equation for this differential equation is:

[tex]r^5 - 7r^4 + 13r^3 - 7r^2 + 12r = 0.[/tex]
Now, we need to find the roots of this equation. Let's denote them as r1, r2, r3, r4, and r5.

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The derivative of f(x) = sin(x²) is f'(x) = 2x × cos(x²).

The chain rule is a rule of calculus used to find the derivative of a composition of functions. It allows us to differentiate a function that is constructed by combining two or more functions, where one function is applied to the output of another function.

To find the derivative of the function f(x) = sin(x²), we need to apply the chain rule of differentiation, which states that if f(x) = g(h(x)), then f'(x) = g'(h(x)) × h'(x).

Here, g(x) = sin(x) and h(x) = x². Therefore, g'(x) = cos(x) and h'(x) = 2x.

Applying the chain rule, we have

f'(x) = g'(h(x)) × h'(x) = cos(x²) × 2x

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The probability that X will be at least 2 is 0.5940 and the probability that X will be between 2 and 4 (inclusive) is 0.3010.

The Poisson distribution is given by the formula:

[tex]P(X = k) = (e^{(-\lambda)} * \lambda ^k) / k![/tex]

where λ is the expected value or mean of the distribution.

In this case, we are given that E(X) = 2.4, so λ = 2.4.

Using a Poisson probability calculator, we can find:

P(X > 2) = 1 - P(X ≤ 2) = 1 - (P(X = 0) + P(X = 1) + P(X = 2))

= [tex]1 - [(e^{(-2.4)} * 2.4^0) / 0! + (e^{(-2.4)} * 2.4^1) / 1! + (e^{(-2.4)} * 2.4^2) / 2!][/tex]

= [tex]1 - [(e^{(-2.4)} * 1) + (e^{(-2.4)} * 2.4) + (e^{(-2.4)} * 2.4^2 / 2)][/tex]

= 1 - 0.4060

= 0.5940 (rounded to four decimal places)

Therefore, the probability that X will be at least 2 is 0.5940.

Using a Poisson probability calculator, we can find:

P(2 < X < 4) = P(X = 3) + P(X = 4)

= [tex](e^{(-2.4)} * 2.4^3 / 3!) + (e^{(-2.4)} * 2.4^4 / 4!)[/tex]

= 0.2229 + 0.0781

= 0.3010 (rounded to four decimal places)

Therefore, the probability that X will be between 2 and 4 (inclusive) is 0.3010.

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If a student draws 1 counter out of the bag without looking, then the probability of drawing an orange counter is 0.25 or 25%.

Probability is a measure of the likelihood or chance of an event occurring. It is a number between 0 and 1, where 0 indicates that the event is impossible, and 1 indicates that the event is certain to occur.

Probability is usually expressed as a fraction, decimal, or percentage. For example, if the probability of an event occurring is 0.5, this means there is a 50% chance that the event will occur.

The probability of an event can be calculated by dividing the number of favorable outcomes by the total number of possible outcomes. For example, if a fair six-sided die is rolled, the probability of rolling a 3 is 1/6, because there is one favorable outcome (rolling a 3) out of six possible outcomes (rolling a 1, 2, 3, 4, 5, or 6).

The probability of drawing an orange counter out of the bag can be calculated by dividing the number of orange counters by the total number of counters in the bag.

The total number of counters in the bag is:

6 + 2 + 10 + 6 = 24

The number of orange counters is:

6

Therefore, the probability of drawing an orange counter is:

6/24 = 1/4 = 0.25

So the probability of drawing an orange counter is 0.25 or 25%.

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One possible set of three equations that are all true and different for 1 2/3 is (5/3) + (1/3) = (8/3), (4/3) + (2/3) = (2), and (10/6) + (1/6) = (11/6).

Each of these equations represents a different way of expressing the same value of 1 2/3, which is equal to 5/3 or 1.6666... when expressed as a decimal.

Overall, these equations demonstrate the flexibility and versatility of mathematical expressions and show how different values can be represented in multiple ways through simple operations like addition and division.

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The probability that Diesel will win her 6th game on the 18th game is approximately 0.000568, or 0.0568%.

The probability that Diesel will win her 6th game on the 18th game is calculated using the binomial distribution formula.

Let's define the following terms:
- n = number of trials (games played) = 18
- k = number of successes (games won by Diesel) = 6
- p = probability of success (Diesel winning a game) = 1/4
- q = probability of failure (Daisy winning a game) = 1 - p = 3/4

The formula for the probability of exactly k successes in n trials is:

P(k) = (n choose k) * p^k * q^(n-k)

where (n choose k) is the binomial coefficient, which represents the number of ways to choose k successes out of n trials. It can be calculated as:

(n choose k) = n! / (k! * (n-k)!)

Plugging in the values, we get:

P(6) = (18 choose 6) * (1/4)^6 * (3/4)^12
= 18! / (6! * 12!) * (1/4)^6 * (3/4)^12
= 18564 * 0.00000244 * 0.0122
= 0.000568

Therefore, the probability that Diesel will win her 6th game on the 18th game is approximately 0.000568, or 0.0568%.

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5. There is no solution since 5 = 7 is a false statement. Option C

6. There is no solution since 7x = 6x is a false statement. Option C

7. The value of the angle BCY = 55 degrees

8. The value of exterior angle , x is 137 degrees

Note that algebraic expressions are described as expressions composed of variables, terms, constants, factors and constants.

From the information given, we have that;

5. 6x +8 - 3 = 8x + 7 -2x

collect the like terms

6x + 5 = 6x + 7

5 = 7

6. 9x + 11 - 2x = 6x + 11

collect the terms

7x = 6x

We can see that for the value of the first, x is zero and for the second, there is no solution

7. We have from the diagram that;

25x + 11x = 180; because angles on a straight line is equal to 180 degrees

add the like terms

36x = 180

Make 'x' the subject of formula

x = 5

<BCY = 11x = 11(5) = 55 degrees

8. The sum of the angles in a triangle is 180 degrees

Then,

62 + 61 + y = 180

y = 180 - 43

But, x + y = 180

x = 180 - 43 = 137 degrees

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Answer: 120

Step-by-step explanation:

The factorial function multiplies all numbers below that number going to 1. For example,

   2! = 2 * 1 = 2

   3! = 3 * 2 * 1 = 6
   4! = 4 * 3 * 2 * 1 = 24

Thus, 5! would be 5 * 4 * 3 * 2 * 1 = 120.

The form of the particular solution of the differential equation x" — x' – 2x = e^t cost – t^2 + cos 3t is x_p(t) = Ae^t cos(t) + Be^t sin(t) + Ct^2 + Dt + Ecos(3t) + Fsin(3t) and the particular solution of the y" – y' + 2y = (2x + 1)e^(x/2) cos (√7/2)x + 3(x^3 – x)e^(x/2) sin (√7/2) x is y_p(x) = (Ae^(x/2) cos(√7/2)x + Be^(x/2) sin(√7/2)x) + (C x^3 + Dx^2 + Ex + F)

Explanation: -

Part (a): -To determine the form of a particular solution to x" - x' - 2x = e^t cos(t) - t^2 + cos(3t),

we look at the non-homogeneous terms on the right-hand side. We see that we have a term of the form e^t cos(t), which suggests a particular solution of the form Ae^t cos(t) or Be^t sin(t).

We also have a polynomial term t^2, which suggests a particular solution of the form At^2 + Bt + C. Finally, we have a term of the form cos(3t), which suggests a particular solution of the form D cos(3t) + E sin(3t).

Thus,

x_p(t) = A e^t cos(t) + B e^t sin(t) + Ct^2 + Dt + E cos(3t) + F sin(3t) is particular solution of the above differential equation.

Part (b): -To determine the form of a particular solution to y" - y' + 2y = (2x + 1)e^(x/2) cos(√7/2)x + 3(x^3 - x)e^(x/2) sin(√7/2)x, we first observe that the right-hand side includes a product of exponential and trigonometric functions. Therefore, a particular solution may take the form of a linear combination of functions of the form e^(ax) cos(bx) and e^(ax) sin(bx).

Additionally, the right-hand side includes a polynomial of degree 3, so we may include terms of the form ax^3 + bx^2 + cx + d in our particular solution.

Overall, a possible form for a particular solution to this differential equation is:

y_p(x) = (Ae^(x/2) cos(√7/2)x + Be^(x/2) sin(√7/2)x) + (C x^3 + Dx^2 + Ex + F)

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On average, the metro train travels a distance of 90 kilometers in a single trip.

Since the metro train completes 4 round trips of 90 kilometres, the total distance traveled in a day would be 4290 = 720 kilometres (since a round trip is equivalent to two journeys of 90 kilometres).

To find the average distance traveled, we need to divide the total distance by the number of trips made. Since 4 round trips have been made, the number of trips made would be 4*2 = 8 (since each round trip is equivalent to 2 trips).

Therefore, the average distance traveled by the metro in a day would be 720/8 = 90 kilometres.

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a) The summation notation of F₂ + F₄ + F₆ + ... + F₂ₙ is ∑ᵢ₌₁ᵗⁿ F₂ᵢ

b) Proved that F₂ + F₄ + F₆ + ... + F₂ₙ = F₂ₙ₊₁ - 1.

The Fibonacci sequence is defined as F₁ = 1, F₂ = 1, and Fₙ = Fₙ₋₁ + Fₙ₋₂ for n ≥ 3.

To express F₂ + F₄ + F₆ + ... + F₂ₙ in summation notation, we can observe that the terms are all even Fibonacci numbers. Thus, we can write:

∑ᵢ₌₁ᵗⁿ F₂ᵢ = ∑ᵢ₌₁ᵗⁿ₋₁ F₂ᵢ + F₂ₙ

where n is even.

We can then use the recurrence relation of the Fibonacci sequence to simplify this:

∑ᵢ₌₁ᵗⁿ F₂ᵢ = ∑ᵢ₌₁ᵗⁿ₋₁ F₂ᵢ + F₂ₙ

= (F₂₁ - 1) + F₂ₙ

= F₂ₙ₊₁ - 1

where we have used the fact that F₂₁ = F₁ = 1.

Therefore, we have shown that F₂ + F₄ + F₆ + ... + F₂ₙ = F₂ₙ₊₁ - 1.

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