Consider the following series: (-1)^ 71n n We will test this series for convergence or divergence. (i) What test(s) is(are) applicable to test this series? Click for List (i) Determine whether this series converges or diverges. O Converges O Diverges (iii) What is the sum of the series? Note: Write the exact answer not the decimal approximation (for example write 1 / not 0.8). Answer: The sum of the series is PO

a. The property damage insurance covers the damage to the fence.

b. The insurance company will pay $7,000 - $1,000 = $6,000 for the fence damage.

c. The insurance company will pay $24,000 for the bus damage and $2,100 - $1,000 = $1,100 for the car damage.

d. The collision insurance policy covers the damage to Stewart's car.

e. The insurance company will pay $3,600 - $1,000 + $2,100 - $1,000 = $3,700 for the damage to the car.

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To build a series for the given function f(x) = (e^(2x) - 1 - 2x)/2x^2, we can start by finding the MacLaurin series for e^(2x) and then manipulate it to obtain the desired series.

The MacLaurin series for e^(2x) is given by:

e^(2x) = Σ (2x)^n / n! for n = 0 to ∞

Expanding the series, we get:

e^(2x) = 1 + 2x + 2x^2/2! + 2^3x^3/3! + 2^4x^4/4! + ...

Now, we can substitute this back into the original function:

f(x) = (e^(2x) - 1 - 2x)/2x^2 = (1 + 2x + 2x^2/2! + 2^3x^3/3! + 2^4x^4/4! + ... - 1 - 2x) / 2x^2

Simplifying, we have:

f(x) = (2x^2/2! + 2^3x^3/3! + 2^4x^4/4! + ...) / 2x^2

Now, we can divide by 2x^2 to obtain the series for f(x):

f(x) = 1/2! + 2x/3! + 2^3x^2/4! + 2^4x^3/5! + ...

Finally, we can write the final answer in proper summation notation:

f(x) = Σ (2^(n-1)x^(n-2)) / n! for n = 2 to ∞

To begin, we can write f(x) as:

f(x) = (1/2x^2)[e^(2x) - 1 - 2x]

Next, we will use the Maclaurin series for e^x, which is:

e^x = 1 + x + (x^2)/2! + (x^3)/3! + ...

Substituting 2x for x, we have:

e^(2x) = 1 + 2x + (4x^2)/2! + (8x^3)/3! + ...

Expanding the first two terms of the numerator in f(x), we have:

f(x) = (1/2x^2)[(1 + 2x + (4x^2)/2! + (8x^3)/3! + ...) - 1 - 2x]

Simplifying, we get:

f(x) = (1/2x^2)[2x + (4x^2)/2! + (8x^3)/3! + ...]

Now we can simplify the coefficients in the numerator by factoring out 2x:

f(x) = (1/x)[1 + (2x)/2! + (4x^2)/3! + ...]

Finally, we can write the series in summation notation:

f(x) = Σ[(2n)!/(2^n*n!)]x^n, n=1 to infinity.

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Answer:

  145.7 cm

Step-by-step explanation:

You want the perimeter of a shape bounded by 4 semicircles of radius 10 cm and two straight lines 10 cm long.

The circumference of a circle with radius 10 cm is ...

  C = 2πr

  C = 2(3.142)(10 cm) = 62.84 cm

The shape is bounded (in part) by 4 semicircles, so 2 full circles. The length of the curved boundary is ...

  curve length = 2 · (62.84 cm) = 125.68 cm

The two straight edges at either end of the figure are equal in length to the radius. That total length gets added to the curve length to form the perimeter.

  P = straight length + curve length

  P = 2·10 cm + 125.68 cm ≈ 145.7 cm

The perimeter is about 145.7 cm.

The circumference of the well is 3.93 ft.

Given, Emma is making a scale drawing of her farm using the scale 1 cm=2.5 ft

Diameter of the well she drew = 0.5 cm

We need to convert the diameter of the well from centimeters to feet, using the given scale.

i.e. 0.5cm = 2.5/2 = 1.25 ft

We know the radius is half of the diameter.

So, r = 1.25/2 = 0.625

We know that the formula for the circumference of a circle is C = 2πr

C = 2*3.14*0.625

= 3.93 ft

Hence, the circumference of the well is 3.93 ft.

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The volume of the block of wood is 78 cubic inches.

What is cube?

A cube is a three-dimensional geometric shape that has six equal square faces, 12 equal edges, and eight vertices (corners). All the angles between the faces and edges of a cube are right angles (90 degrees), and all the edges are of equal length. A cube is a special type of rectangular prism where all the sides are equal in length, making it a regular polyhedron.

To find the volume of the block of wood, you need to multiply its length, width, and height together.

Volume = length x width x height

Volume = 6.5 inches x 1.5 inches x 8 inches

Volume = 78 cubic inches

Therefore, the volume of the block of wood is 78 cubic inches.

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The equation required to modelled sound waves is given by y₁ + y₂ = 40 sin 3x cos θ.

Equations used to modelled sound waves are,

y₁= 20 sin (3x + θ)

A waves travelling in the opposite direction are,

y₂ = 20 sin (3x - θ)

To show that y₁ + y₂ = 40 sin 3x cos θ,

Simply substitute the given expressions for y₁ and y₂ and simplify using trigonometric identities.

sin A + sinB = 2 sin  [(A + B)/2] cos [(A - B)/2].

y₁ + y₂ = 20 sin (3x + θ) + 20 sin (3x - θ)

⇒y₁ + y₂ = 20 ( sin (3x + θ) + sin (3x - θ) )

Using the identity for the sum of two sines, simplify this expression,

⇒y₁ + y₂ = 2 ×20 × sin (3x + θ + 3x -  θ)/2 cos (3x + θ - 3x + θ)/2

⇒ y₁ + y₂ = 2 ×20 × sin (3x) cos (θ)

⇒ y₁ + y₂ = 40 sin (3x) cos (θ)

Therefore, for the sound waves y₁ + y₂ = 40 sin 3x cos θ, as required.

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The above question is incomplete, the complete question is:

Sound waves can be modeled by the equations of the form y₁= 20 sin (3x + θ). a wave traveling in the opposite direction can be modeled by y₂ = 20 sin (3x - θ). show that y₁ + y₂ = 40 sin 3x cos θ.

The equation that could be Orhan's equation for the linear function that relates temperature and refreshment sales is   Y = 15x + 40.

This is because the equation is in the form of y = mx + b, where m is the slope (or rate of change) and b is the y-intercept. In this case, the slope is 15, which means that for every increase of 1 degree in temperature, there will be an increase of 15 units in refreshment sales.

The y-intercept is 40, which means that even at a temperature of 0 degrees, there will still be some refreshment sales (40 units).

The other equations do not have a linear relationship between temperature and sales, as they either have a quadratic term (A), a negative slope (C), or a large negative constant term (D).

Hence, option B is the correct answer.

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The correct answer is 9% interest rate and 25 years.

To find the correct answer, we can use the mortgage payment formula:

M = P * (r(1 + r)^n) / ((1 + r)^n - 1)

Where:
M = monthly mortgage payment ($629.81)
P = principal loan amount ($70,000)
r = monthly interest rate (annual interest rate / 12)
n = total number of payments (years * 12)

We can test each option to see which one fits the given mortgage payment.

1) 9%, 20 years:
r = 0.09 / 12 = 0.0075
n = 20 * 12 = 240

M = 70000 * (0.0075(1 + 0.0075)^240) / ((1 + 0.0075)^240 - 1)
M ≈ $629.29 (close but not exact)

2) 9%, 25 years:
n = 25 * 12 = 300

M = 70000 * (0.0075(1 + 0.0075)^300) / ((1 + 0.0075)^300 - 1)
M ≈ $629.81 (matches the given mortgage payment)

Based on our calculations, the correct answer is 9% interest rate and 25 years.

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After considering all the given data we come to the conclusion that the volume of the prism is 1440 in³, under the condition that A rectangular pyramid has a volume of 480 in.

The volume of a rectangular pyramid is represented by the formula
(1/3) × base area × height.
Now, the volume of a rectangular prism is given by the formula
base area × height.
Now if we consider the rectangular prism has a base and height congruent to the pyramid, then the base area of the prism is equivalent to the base area of the pyramid. Then, the volume of the prism is equivalent to three times that of the pyramid.

Hence, the volume of the pyramid is 480 in³, we can evaluate the volume of the prism
Volume of prism = 3 × Volume of pyramid
= 3 × (1/3) × Base area × Height
= Base area × Height
Then, the volume of the rectangular prism is
480 × 3
= 1440 in³.
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a. The Taylors may want to avail themselves of the help of a professional investment advisor.

b. They may prefer to find a reputable planner with appropriate credentials and experience

c,.  The Taylors should track their expenses more closely because overspending without replacement income can be disastrous

Because successfully managing a large investment portfolio takes a great deal of time and​ knowledge, the Taylors may want to avail themselves of the help of a professional investment advisor.

2) They may prefer to find a reputable planner with appropriate credentials and experience. It will be important for them to shop around to find someone with whom they feel comfortable. A​ fee-only planner might be the best​ choice, especially if their current investments are doing well and the Taylors are not interested in making big changes that would generate​ sales, and​ commissions, for the planner

e) Whether or not Tim and Jill continue to work with a financial planner depends on their financial​ knowledge, time and commitment. Given their​ successful, independent, management of their financial situation to​ date, they may want to develop their own plan and have it reviewed by a planner as confirmation that they are on the right track.

f) The Taylors should track their expenses more closely because overspending without replacement income can be disastrous. In the event of an unexpectedly bad financial situation or a long downturn in the​ economy, they would not have the time or resources to rectify their misfortune and achieve their goals.

Their big five expenses are likely to be the same as the average U.S. household​ - taxes,​ food, housing, medical care and transportation. Most retirement benefits will be​ taxable, as will other investment earnings. Depending on the age of the house or​ appliances, repairs or replacements may be necessary.

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Answer:

3a - 2b - c + 16 = 23

Step-by-step explanation:

so we want to write an equetion which containe a, b and c so we have given

4a - 2b = 10 and a + c = 3

so we are going to differentiate 10 to 7 + 3 it will be

4a - 2b = 10

4a - 2b = 7 + 3 ...then we insert a + c in place of 3 b/c they are equal

4a - 2b = 7 + a + c .... we take to the left side of the equal sighn

4a - a - 2b - c = 7

3a - 2b - c = 7

thrn if we want to write the equetion =23 we add 16 both side 3a - 2b - c + 16 = 23 .

The circumference of the given circle with TQ = 8 units is given by approximately 50.26 units.

We know that the formula for the circumference of a circle with radius of 'r' units is given by,

P = 2πr

Here in the given figure we can see that the length TQ is a radius for the given circle with center at point Q.

Given the value of TQ = 8 units.

So, radius = 8 units.

So the circumference of the circle is given by

= 2πr

= 2π*8

= 16π

= 50.26 units [taking π = 3.14 and approximating the value to the two decimal places]

Hence the circumference of circle is 50.26 units approximately.

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The problem is to find the volume of region E enclosed by a cone and a sphere. The solution involves converting the equations to cylindrical coordinates, finding the limits of integration, and setting up a triple integral. The volume can be calculated by evaluating the integral.

To compute the volume of E using cylindrical coordinates, we first need to find the limits of integration for r, θ, and z. Since E is enclosed by the cone 7 = — x² + y² and the sphere x² + y2 + z2 = 32, we need to find the equations that define the boundaries of E in cylindrical coordinates.

To do this, we convert the equations of the cone and sphere to cylindrical coordinates:

- Cone: 7 = — x² + y² → 7 = — r² sin² θ + r² cos² θ → r² = 7 / sin² θ
- Sphere: x² + y² + z² = 32 → r² + z² = 32

We can see that the cone intersects the sphere when r² = 7 / sin² θ and r² + z² = 32. Solving for z, we get z = ±√(32 - 7/sin² θ - r²). We also know that the cone extends to the origin (r = 0), so our limits of integration for r are 0 to √(7/sin² θ).

For θ, we can see that E is symmetric about the z-axis, so we can integrate over the entire range of θ, which is 0 to 2π.

For z, we need to find the range of z values that are enclosed by the cone and sphere. We can see that the cone intersects the z-axis at z = ±√7. We also know that the sphere intersects the z-axis at z = ±√(32 - r²). Thus, the range of z values that are enclosed by the cone and sphere is from -√(32 - r²) to √(32 - r²) if r < √7, and from -√(32 - 7/sin² θ) to √(32 - 7/sin² θ) if r ≥ √7.

Now that we have our limits of integration, we can set up the triple integral to compute the volume of E:

Vol(E) = ∫∫∫ E dV
= ∫₀^(2π) ∫₀^√(7/sin² θ) ∫₋√(32 - r²)^(√(32 - r²)) F(r, θ, z) dz dr dθ

where F(r, θ, z) = 1 (since we're just computing the volume of E).

Using the limits of integration we found, we can evaluate this triple integral using numerical integration techniques or a computer algebra system.
To find the volume of the region E enclosed by the cone 7 = -x² + y² and the sphere x² + y² + z² = 32, we can use triple integration in cylindrical coordinates. We need to determine the limits of integration for r, θ, and z.

First, rewrite the equations in cylindrical coordinates:
Cone: z = -r² + 7
Sphere: r² + z² = 32

Now, find the intersection between the cone and the sphere by solving for z in the cone equation and substituting it into the sphere equation:
r² + (-r² + 7)² = 32
Solving for r, we get r = √7.

Now, we can find the limits of integration:
r: 0 to √7
θ: 0 to 2π
z: -r² + 7 to √(32 - r²)

Since the volume is the region enclosed by these surfaces, we can set up the triple integral:
Vol(E) = ∫∫∫ r dz dθ dr

With the limits of integration:
Vol(E) = ∫(0 to 2π) ∫(0 to √7) ∫(-r² + 7 to √(32 - r²)) r dz dθ dr

Evaluating this integral will give us the volume of the region E.

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Stella drove 150 miles this week to and from school in the van.

To determine how many miles Stella drove this week, we can use the given information about the van's gas mileage.

First, we know that the van can drive 60 miles using 10 gallons of gasoline. We can calculate the miles per gallon (mpg) by dividing the miles driven by the gallons of gasoline used:
[tex]Miles per gallon (mpg) = \frac{60 miles}{10 gallons}  = 6 mpg[/tex]

Now, we know that Stella used 25 gallons of gas driving to and from school this week in the van. To find out how many miles she drove, we can multiply the gallons of gas she used by the van's mpg:
Miles driven = 25 gallons x 6 mpg = 150 miles

So, Stella drove 150 miles this week to and from school in the van. We know this by calculating the van's gas mileage (6 mpg) and multiplying it by the gallons of gas Stella used (25 gallons).

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Answer:

x = 2

Step-by-step explanation:

A secant is a straight line that intersects a circle at two points.

A segment is part of a line that connects two points.

According to the Intersecting Secants Theorem, the product of the measures of one secant segment and its external part is equal to the product of the measures of the other secant segment and its external part.

The given diagram shows two secant segments that intersect at an exterior point.  

Therefore, according to the Intersecting Secants Theorem:

[tex](6x-1+7) \cdot 7=(x+3+9) \cdot 9[/tex]

Solve for x:

[tex]\begin{aligned}(6x+6) \cdot 7&=(x+12) \cdot 9 \\42x+42&=9x+108\\42x+42-9x&=9x+108-9x\\33x+42&=108\\33x+42-42&=108-42\\33x&=66\\33x\div33&=66\div33\\x&=2 \end{aligned}[/tex]

Therefore, the value of x is x = 2.

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The linear function representing relation of the number of tickets sold and number of hours since tickets have been on sale is given by y = 32x.

Let us consider the two points of the linear function are,

(x₁, y₁) = (2, 64) and (x₂, y₂) = (6, 192).

Use the two-point form of the equation of a line .

Equation of linear function shows relationship between number of tickets sold y and the number of hours since tickets have been on sale x

Slope of the line is,

slope = (y₂ - y₁) / (x₂ - x₁)

         = (192 - 64) / (6 - 2)

         = 128 / 4

         = 32

Apply the point-slope form of the equation of a line with the point (2, 64),

y - y₁= m(x - x₁)

⇒ y - 64 = 32(x - 2)

⇒ y - 64 = 32x - 64

⇒ y = 32x

Check if the equation of the line passes through the third point (18, 576),

y = 32x

⇒576 = 32(18)

⇒576 = 576

Since the equation of the line passes through all three points,

Therefore, linear function between the number of tickets sold and number of hours since tickets have been on sale is y = 32x.

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The above question is incomplete, the complete question is:

A linear function has the table of values shown. The information in the table shows the number of tickets sold on opening night of a movie as a function of the number of hours since the tickets have been on sale.

Number of Hours (x) 2 6 18

Number of Tickets Sold (y) 64 192 576

Write the equation that gives the number of tickets sold, y, as a linear function of the number of hours, x, since the tickets have been on sale. Enter your answer in the box

The intensity of the Galesburg earthquake was approximately 63.1 times larger than the intensity of the Stony Point earthquake.

To compare the intensities of the Galesburg and Stony Point earthquakes, we can use the Richter scale formula M = log(I/I₀), where M is the magnitude of the earthquake, I is the intensity of the earthquake, and I₀ is a reference intensity.

Given:

Magnitude of the Galesburg earthquake (M₁) = 4.2

Magnitude of the Stony Point earthquake (M₂) = 2.5

To find the intensity ratio between the two earthquakes, we can use the formula:

I₁/I₂ = 10^(M₁ - M₂)

Substituting the given magnitudes into the formula:

I₁/I₂ = 10^(4.2 - 2.5)

Calculating the exponent:

I₁/I₂ = 10^1.7

Using a calculator, we find that 10^1.7 is approximately 50.12.

Therefore, the intensity of the Galesburg earthquake (I₁) was approximately 50.12 times larger than the intensity of the Stony Point earthquake (I₂).

Alternatively, we can also express this as the intensity of the Galesburg earthquake being approximately 63.1 times larger than the intensity of the Stony Point earthquake (since 50.12 is approximately equal to 63.1).

Hence, the intensity of the Galesburg earthquake was approximately 63.1 times larger than the intensity of the Stony Point earthquake.

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Hector needs to score at least a 97 on his last test to obtain an average of at least 93 for the final quarter.

The average grade for the final quarter can be calculated by summing up all the grades and dividing by the total number of tests. In this case, Hector has taken 5 tests, and his grades are 89, 93, 100, 98, and 95. Therefore, his current total score is 89+93+100+98+95 = 475.

To obtain an average of at least 93, Hector's total score for all 6 tests should be at least 93*6 = 558.

So, Hector needs to score a minimum of 558 - 475 = 83 on his last test. Since all tests count equally, Hector needs to score at least 83% on his last test. Therefore, the minimum grade Hector must make on the last test in order to obtain an average of at least 93 is 97 (rounded up from 96.6).

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When the price of the new product is $9.25, the demand for the product is 200 units.

The quantity of a specific commodity or service that consumers are willing and able to buy at a specific price and time is referred to as demand. It stands for consumers' willingness and capacity to pay for a good or service.

The demand for a new product at a price of x dollars is denoted by the notation D(x). So, the notation D(9.25) represents the demand for the new product when the price is $9.25. According to the given information, D(9.25) = 200.

Therefore, we can interpret this as: when the price of the new product is $9.25, the demand for the product is 200 units.

D(9.25) = 200

where D(x) represents the demand for the new product when the price is x dollars. We substitute x = 9.25 into the equation to find the demand when the price is $9.25, which is 200 units.

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The angle of elevation of the rover to the nearest thousandth of a degree is 19.173 degrees.

The angle of elevation is the angle between the horizontal and the line of sight from the observer to the object being observed. In this case, the object is the rover and the observer is at the bottom of the crater.

We can use the trigonometric function tangent to find the angle of elevation:

tan(angle) = opposite / adjacent

where opposite is the vertical distance (65 meters) and adjacent is the horizontal distance (180 meters).

tan(angle) = 65 / 180

angle = arctan(65 / 180)

Using a calculator, we get:

angle = 19.173 degrees

Therefore, the angle of elevation of the rover to the nearest thousandth of a degree is 19.173 degrees.

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In the next 20 students surveyed, you would expect 5 to own a dog and a cat

From the question, we have the following parameters that can be used in our computation:

Dog = 42

Cat = 34

Dog and cat = 15

Neither = 9

This means that

P(Dog and cat) = 15/100

When evaluated, we have

P(Dog and cat) = 5/20

So, when the next 20 students surveyed, we have

Dog and cat = 5/20 * 20

Evaluate

Dog and cat = 5

Hence, the number of dogs and cats is 5

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Answer:

Para comparar las propuestas de los bancos, debemos llevar las tasas de interés a una misma unidad de tiempo. Podemos convertir la tasa del Banco A de bimestral a mensual multiplicándola por 2 (ya que hay 6 bimestres en 1 año):

Tasa del Banco A: 1,5% * 2 = 3% mensual

Tasa del Banco B: 0,5% mensual

Para calcular los intereses que se obtendrán en cada banco, podemos utilizar la fórmula del interés compuesto:

I = C * ((1 + r/n)^(n*t) - 1)

Donde:

I es el interés

C es el capital inicial

r es la tasa de interés en forma decimal

n es el número de veces que se capitaliza al año

t es el tiempo en años

Para el Banco A, como la tasa está en meses, capitalizaremos mensualmente (n=12):

I = 40 000 * ((1 + 0,03/12)^(12*2) - 1) = 4 896,18 soles

Para el Banco B, como la tasa ya está en meses, capitalizaremos mensualmente (n=12):

I = 40 000 * ((1 + 0,005)^(12*2) - 1) = 4 225,48 soles

Por lo tanto, la propuesta más conveniente es la del Banco A, ya que ofrece una tasa de interés mayor y genera un interés total de 4 896,18 soles. En cambio, el Banco B genera un interés total de 4 225,48 soles.

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Tardarán aproximadamente 3.6 horas.

Para resolver este problema, podemos establecer una relación proporcional entre el número de hojas impresas y el tiempo requerido. Si 4 impresoras tardan 3 horas en imprimir 5000 hojas, podemos establecer la proporción

4 impresoras / 3 horas = 5000 hojas / x horas

Donde x representa el tiempo que tardarán en imprimir 6000 hojas. Podemos resolver esta proporción utilizando regla de tres:

4 / 3 = 5000 / x

Multiplicando en cruz, obtenemos:

4x = 3 * 5000

4x = 15000

x = 15000 / 4

x = 3750

Por lo tanto, tardarán aproximadamente 3750 horas en imprimir 6000 hojas.

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Yes, your friend is not correct about the stem and leaf plot.

The stem and leaf plot made by your friend is:

Stem | Leaves

2 | 5, 6

4 | 2, 4, 7

5 | 0, 1, 5, 5

Key : 4 | 2 = 42

When the data points from these are taken, we have :

25 , 26 , 42 , 44 , 47 , 50, 51, 55, 55

This is the same as the data provided of :

51, 25, 47, 42, 55, 26, 50, 44, 55

So, your friend's stem and leaf plot is indeed correct.

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Answer:

1 hour to build a website

5 hours to update websites

Step-by-step explanation:

x is the hours to build a website

y is the hours to update websites

x + y = 6 ------> 25x + 25y = 150

25x + 15y = 100

10y = 50

y = 5

25x + 15 (5) = 100

25x + 75 = 100

25x = 25

x = 1

So, LaShawn needs 1 hour to build a website and 5 hours to update websites to allow him to reach his goals.

Here is a two-way table that summarizes the information:

The marginal frequencies (totals) are shown in the last row and last column. The dealership has a total of 98 cars on its lot, which is the sum of the new and used cars. There are 55 new cars and 15 used cars, which is the sum of the domestic and foreign cars in each category.

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The dimensions of the larger space would be roughly 300 x 350 x 461 feet multiplied by the scaling factor of 3.01. This gives dimensions of approximately 903 x 1053 x 1388 feet.

To determine the appropriate dimensions of a space that can accommodate 200,000 people, we can use the concept of similarity.

We know that the smaller event had a crowd of 22,000 people and the area was roughly a right triangle with side lengths of 300, 350, and 461 feet. We can use the ratio of the number of people to the area to find the scaling factor.

The area of the triangle is (1/2) x 300 x 350 = 52,500 square feet.
The ratio of people to area is 22,000/52,500 = 0.42 people per square foot.

To accommodate 200,000 people, we need an area of 200,000/0.42 = 476,190.5 square feet.

Assuming we maintain the same shape and proportions, we can use the area of the triangle as a guide to find the dimensions of the larger space. Let x be the scaling factor. Then:

(1/2) x (300x) x (350x) = 476,190.5
52,500x² = 476,190.5
x² = 9.05
x = 3.01

In summary, we can use the ratio of people to area to determine the appropriate dimensions of a space that can accommodate 200,000 people. By maintaining the same shape and proportions of a smaller event, we can find the scaling factor needed to determine the dimensions of the larger space.

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The area of Coby's room is 80 square feet.

The area of a rectangle is given by the product of its length and width. Here, the length of the room is given as 10 feet and the width is given as 8 feet. Therefore, the area of the room is:

Area = Length x Width

Area = 10 feet x 8 feet

Area = 80 square feet

Hence, the area of Coby's room is 80 square feet. It is important to note that when calculating the area of a rectangle, the units of length are multiplied to obtain the unit of area. In this case, the units of length are feet, so the unit of area is square feet.

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The completed table with residuals rounded to hundredths place:

| Hours | Retweets | Predicted Value | Residual |

| 1     | 65       |-79.86          |-144.86   |

| 2     |90        |-58.96          |-31.04    |

|3      |162       |-20.16          |-141.84   |

|4      |224       |17.64           |-206.64   |

|5      |337       |75.54           |-262.54   |

|6      |466       |133.44          |-332.44   |

|7      |780       |191.34          |-409.34   |

|8      |1087      |249.24          |-238.24   |

We can evaluate the predicted value by staging the given hours in the function

f(x) = 138.9x - 218.76.

for instance,  hours = 1:

f(1) = (138.9 x 1) - 218.76

= -79.86

likewise, we can find predicted values for all hours.

Residual = Actual Value - Predicted Value

For instance, for hours = 1:

Residual = Actual Value - Predicted Value

       = 65 - (-79.86)

       = 144.86

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The formula for finding the surface area (S) of a cube is S = 6s^2

The surface area of a cube can be found using the formula:

SA = 6s^2

where SA represents the surface area and s represents the length of one side of the cube.

The formula is derived by considering the fact that a cube has six square faces, all of which have the same area since all sides of a cube are congruent. Therefore, to find the surface area of a cube, we simply need to find the area of one of its faces and multiply it by six. Since all faces are squares, the area of one face can be found using the formula for the area of a square:

A = s^2

where A represents the area of the square and s represents the length of one side of the square.

Thus, substituting A = s^2 into the formula for the surface area, we get:

SA = 6A = 6s^2

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