Consider the following table.
Weekly hours worked Probability
1-30 (average=23) 0.08
31-40 (average=36) 0.10
41-50 (average=43) 0.74
51 and over (average=54) 0.08
Find the mean of this variable.
O 41.6
O 39.0
O 31.8
O 25.2

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.

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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

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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

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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

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The transformation that will take parallelogram PQRS onto itself is given as follows:

D. a rotation of 360° counterclockwise about the center of the

parallelogram.

A rotation over a line or over a degree measure is going to change the orientation of the figure.

To keep the same orientation, the rotation must be over the measure of the circumference of a circle, which is of 360º.

Hence option D is the correct option in the context of this problem.

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Answer:

Step-by-step explanation:

Answer:

t = 3 meters

Step-by-step explanation:

From the given figure,

Perimeter = 16 meters

Now, the formula for perimeter of a rectangle = 2(l + b)

Where,

'l' is the length of the rectangle

and

'b' is the breadth of the rectangle.

Since length is the longest side of a rectangle, therefore from the given figure

=> l = 5 meters

and

=> b = t meters

Substituting values in the formula,

16 = 2(5 + t)

=> 16/2 = 5 + t

=> 8 = 5 + t

=> 8 - 5 = t

=> t = 3 meters

The power expression (-4 + 3i)^3 in rectangular form is 117 + 44i

To find the cube of the complex number (-4 + 3i), we can expand it using the binomial theorem or by using the properties of complex conjugates.

Here's one way to do it:

(-4 + 3i)^3

= (-4 + 3i)^2 (-4 + 3i)

= (16 - 24i + 9i^2) (-4 + 3i)

= (16 - 24i - 9) (-4 + 3i) (since i^2 = -1)

= (-17 - 24i) (-4 + 3i)

= -4(-17) + 3(-17i) - 24i(-4) - 24i(3i)

= 68 - 51i + 96i + 72

= 117 + 44i

Therefore, (-4 + 3i)^3 is equal to 117 + 44i in rectangular form.

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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).

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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.

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The perfect square trinomial as a squared binomial. is B  (c - 7)²

A perfect square trinomial refer to a  trinomial (that is it has an expression with  three  perfect terms) which can be factored into a square of a binomial (which is an  expression with two terms). It has the forms below.

+a² + 2ab + b²

where  a and b are  constants.

This is  a perfect square ,  consider the square of the binomial

This indicate  that the trinomial a² + 2ab + b² is the perfect  square of the binomial a + b.

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The correct option is C)Yes, using the result from the 2014 survey only slightly increases the sample size. This means that using the result from the 2014 survey, which estimated the proportion of e-cigarette users, only slightly increases the sample size needed for the current survey.

Proportion refers to the relative or fractional amount or share of a particular characteristic or attribute within a population or sample. It is commonly expressed as a percentage or a decimal, representing the ratio of the number of individuals or items exhibiting the characteristic of interest to the total number of individuals or items in the population or sample.

According to the given information:

C. Yes, using the result from the 2014 survey only slightly increases the sample size.

The sample size required for a survey depends on several factors, including the desired confidence level, margin of error, and the estimated proportion of the population with the characteristic of interest (in this case, the current e-cigarette usage rate).

In this scenario, the confidence level is given as 99% and the margin of error as 2 percentage points. The estimated proportion of the population with the characteristic of interest is 3.74% based on the 2014 survey. Using these parameters, a sample size can be calculated using a sample size formula for estimating proportions.

The formula for calculating the sample size for estimating proportions is:

n = (Z^2 * p * (1-p)) / (E^2)

Where:

n = sample size

Z = z-score corresponding to the desired confidence level

p = estimated proportion of the population with the characteristic of interest

E = margin of error

Plugging in the given values:

Confidence level = 99% => Z = 2.62 (corresponding z-score for a 99% confidence level)

Margin of error = 2 percentage points => E = 0.02

Estimated proportion of e-cigarette users from the 2014 survey = 3.74% => p = 0.0374

Using these values in the sample size formula, we get:

n = (2.62^2 * 0.0374 * (1-0.0374)) / (0.02^2)

n ≈ 1022.8

So, the sample size required for the current survey is approximately 1023. This means that using the result from the 2014 survey, which estimated the proportion of e-cigarette users, only slightly increases the sample size needed for the current survey.

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Answer:

Step-by-step explanation:

6000/100=60

60*5=300

300*4=1200

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

Answer:

The Correct answer is slope=Undefined

The eigenvalues of the given matrix are -1 and 2. The eigenspace corresponding to the eigenvalue -1 is spanned by the vector [1, 2, 0], and the eigenspace corresponding to the eigenvalue 2 is spanned by the vector [1, 0, 1].

To find the eigenvalues of the given matrix, we need to solve the characteristic equation. The characteristic polynomial is given as:

|A - λI| = 0

where A is the given matrix, λ is the eigenvalue, and I is the identity matrix.

Substituting the given matrix into the characteristic equation, we get:

|[-1, 8, -4; -4, 7, -1; 8, -4, 6] - λ[1, 0, 0; 0, 1, 0; 0, 0, 1]| = 0

which simplifies to:

|[-1-λ, 8, -4; -4, 7-λ, -1; 8, -4, 6-λ]| = 0

Expanding the determinant, we get:

(-1-λ)[(7-λ)(6-λ) - (-1)(-4)] - 8[-4(6-λ) - (-1)(8)] + (-4)[-4(-4) - 8(8)] = 0

Simplifying further, we get:

(λ+1)(λ^2 - 2λ - 15) + 8(λ-2) + 4(4 - 4λ - 64) = 0

This is a cubic equation in λ. Solving for λ, we find that the eigenvalues are λ = -1, λ = 2, and λ = -3.

Next, we need to find the eigenvectors corresponding to each eigenvalue. For λ = -1, substituting λ = -1 into the matrix equation (A - λI)v = 0, where v is the eigenvector, we get:

|[-2, 8, -4; -4, 8, -1; 8, -4, 7]|v = 0

Row reducing the augmented matrix, we get:

[-2, 8, -4; -4, 8, -1; 8, -4, 7] --> [1, -4, 2; 0, 0, 1; 0, 0, 0]

The reduced row-echelon form shows that the eigenvector corresponding to λ = -1 is [1, 2, 0].

For λ = 2, substituting λ = 2 into the matrix equation (A - λI)v = 0, we get:

|[-3, 8, -4; -4, 5, -1; 8, -4, 4]|v = 0

Row reducing the augmented matrix, we get:

[-3, 8, -4; -4, 5, -1; 8, -4, 4] --> [1, -8/3, 4/3; 0, 1, -5/3; 0, 0, 0]

The reduced row-echelon form shows that the eigenvector corresponding to λ = 2 is [1, 0, 1].

Therefore, the eigenvalues of the given matrix are -1 and 2, and the corresponding eigenvectors are [1, 2,].

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Answer:

26.4 degrees.

Step-by-step explanation:

Difference = subtraction.

You have to do 21.8 - (-4.6) = 26.4.  

Step-by-step explanation:

1st we want to find the measure of <1 so we use cos

cos( 1 ) =18/30

cos( 1 ) =18/30 cos (1) = 0.6

cos( 1 ) =18/30 cos (1) = 0.61= cos^-1(0.6)

cos( 1 ) =18/30 cos (1) = 0.61= cos^-1(0.6)1° = 53.13° so the angle of 1 is 53.13°

2nd we can solve angle 2 by using sin

sin(2) = 18/30

sin(2) = 18/30 sin(2) = 0.6

sin(2) = 18/30 sin(2) = 0.62 = sin^-1(0.6)

2 = 36.869° round to 36.87°

so the angle 2 is 36.87°

The derivative of P with respect to a is 828/[tex]a^{11}[/tex].

Starting with the given expression using chain rule:

P = ln(92) - 9 ln(a)

We can rewrite this using the properties of logarithms:

P = ln(92) - ln([tex]a^9[/tex])

P = ln(92/[tex]a^9[/tex])

Now, we can find the derivative of P using the chain rule:

dP/da = d/dx [ln(92/[tex]a^9[/tex])] * d/dx [92/[tex]a^9[/tex]]

Using the chain rule:

dP/da = [-9/a] * [-92/[tex]a^{10}[/tex]]

Simplifying:

dP/da = 828/[tex]a^{11}[/tex]

Therefore, the derivative of P with respect to a is 828/[tex]a^{11}[/tex].

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The area under the curve that lies between z = -0.36 and z = 1.68 is approximately 0.5941.

To find the area under the curve between two z-scores, we need to use a standard normal distribution table or a calculator that can calculate the cumulative distribution function (CDF) of the standard normal distribution. The CDF represents the area under the curve to the left of a given z-score.

Using a standard normal distribution table or calculator, we can find the CDF values for z = -0.36 and z = 1.68. Let's assume that the CDF value for z = -0.36 is 0.3594 and the CDF value for z = 1.68 is 0.9535.

The area under the curve between z = -0.36 and z = 1.68 can be calculated as follows:

Area = CDF(1.68) - CDF(-0.36)

Area = 0.9535 - 0.3594

Area = 0.5941

Therefore, the area under the curve that lies between z = -0.36 and z = 1.68 is approximately 0.5941. This means that the probability of observing a standard normal random variable between these two z-scores is 0.5941 or 59.41%.

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The equation that describes the relationship between the rate of change and the current amount of radioactive material is: dQ/dt = -kQ.

This equation represents the fact that the rate at which a radioactive material decays (dQ/dt) is proportional to the current amount of the material (Q) and is negative because the material is decreasing over time. The proportionality constant is represented by -k, where k is a positive constant.

This equation is a first-order linear differential equation that models exponential decay, which is commonly observed in radioactive materials. The solution to this equation, Q(t) = Q0 * e^(-kt), provides the amount of radioactive material remaining at any time t, given an initial amount Q0.

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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.

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The number of elements in set f is 161, in the union of sets e and f is 194 and the complement of set u has zero elements.

Based on the given information, we can use the formula for calculating the number of elements in a set union:

n(e ∪ f) = n(e) + n(f) - n(e ∩ f)

Using the values given, we can rearrange the formula to solve for n(f):

n(f) = n(e ∪ f) - n(e) + n(e ∩ f)

Plugging in the values, we get:

n(f) = 194 - 106 + 73 = 161

Therefore, the number of elements in set f is 161.

Next, we can use the formula for calculating the number of elements in a set intersection:

n(e ∩ f) = n(e) + n(f) - n(e ∪ f)

Using the values given, we can rearrange the formula to solve for n(e ∪ f):

n(e ∪ f) = n(e) + n(f) - n(e ∩ f)

Plugging in the values, we get:

n(e ∪ f) = 106 + 161 - 73 = 194

Therefore, the number of elements in the union of sets e and f is 194.

Finally, we can use the formula for calculating the complement of a set:

n(U\A) = n(U) - n(A)

Using the values given, we can plug in and solve for the complement of set u:

n(U\U) = n(U) - n(U) = 0

Therefore, the complement of set u has zero elements.

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To win the Powerball jackpot, you need to choose the correct five numbers from the integers 1-69 and pick the correct Powerball, which is one number picked from the integers 1-26. The order in which you pick the numbers is not relevant.

To calculate the number of ways to choose the correct five numbers, we use combinations. The expression for combinations is nCk, where n is the number of items available to be chosen from, and k is the number of items chosen. In this case, n = 69 and k = 5. The number of ways to choose five numbers from the integers 1-69 is calculated as:
69C5 = 69! / (5!(69-5)!) The symbol ! is called "factorial." The Factorial of a natural number is the product of the number and all natural numbers below it. For instance, 4! = 4 × 3 × 2 × 1 = 24.  So, the combination can be simplified as:
69C5 = 69! / (5!(69-5)!) = 69 × 68 × 67 × 66 × 65 / (5!) = 11,238,513 Therefore, there are 11,238,513 ways to choose the correct five numbers from the integers 1-69.

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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]

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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.

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The sum of the series is 1/2. The sequence An= (6n) / (4n+3) converges to 3/2.

The first series can be written as:

∑n=1 to [infinity] (3^n-1) / (8^n) = ∑n=1 to [infinity] [(3/8)^n - (1/8)^n]

We can simplify the series as:

∑n=1 to [infinity] (3^n-1) / (8^n) = [(3/8)^1 - (1/8)^1] + [(3/8)^2 - (1/8)^2] + [(3/8)^3 - (1/8)^3] + ...

= (3/8 - 1/8) + (9/64 - 1/64) + (27/512 - 1/512) + ...

= 2/8 + 8/64 + 26/512 + ...

=(1/4) + (1/8) + (1/32) + ...

This is a geometric series with first term a = 1/4 and common ratio r = 1/2. Since the absolute value of r is less than 1, the series converges. The sum of the series is:

sum = a / (1 - r) = (1/4) / (1 - 1/2) = (1/4) / (1/2) = 1/2

For the second sequence:

The sequence is given by An = (6n) / (4n+3).

Taking the limit as n approaches infinity, we have:

lim n→∞ An = lim n→∞ (6n) / (4n+3) = lim n→∞ (6/4 + 9/(4n+3))

As n approaches infinity, the second term goes to zero, and we are left with:

lim n→∞ An = 3/2

Thus, the sequence converges to 3/2.

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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).

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I'm sorry but i can't help with this BUT i can give you a graph calculator

You can use Desmos graphing calculator to plot the inequality (y\ge-x^2-1).

h t t p s : / /w w w . d e s m o s. c o m / c a l c u l a t o r

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.

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Once you find their values, yp(x) is the particular solution.

To find the particular solution for the given non-homogeneous differential equations, we use the method of undetermined coefficients.

1) y'' - 2y' + y = 7e^t*cos(t)

For this equation, we assume a particular solution of the form:
yp(t) = (Ae^t)*cos(t) + (Be^t)*sin(t)

Plug this into the given equation and solve for A and B. Once you find their values, yp(t) is the particular solution.

2) y'' - y' + 9y = 3sin(3x)

For this equation, we assume a particular solution of the form:
yp(x) = C*cos(3x) + D*sin(3x)

Plug this into the given equation and solve for C and D. Once you find their values, yp(x) is the particular solution.

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