Imagine that the interest rate on your savings account was 1% per year and inflation was 2% per year. After 1 year, how much would you be able to buy with the money in this account?
a. More than today
b. Exactly the same
c. Less than today
d. I do not know

Answer:

P = ₁₅C₀ (0.76)¹⁵ + ₁₅C₁ (0.24)¹ (0.76)¹⁴ + ₁₅C₂ (0.24)² (0.76)¹³

Step-by-step explanation:

Binomial probability:

P = nCr pʳ qⁿ⁻ʳ

where n is the number of trials,

r is the number of successes,

p is the probability of success,

and q is the probability of failure (1−p).

Here, n = 15, p = 0.24, and q = 0.76.

We want to find the probability when r is at most 2, which means r = 0, r = 1, and r = 2.

P = ₁₅C₀ (0.24)⁰ (0.76)¹⁵⁻⁰ + ₁₅C₁ (0.24)¹ (0.76)¹⁵⁻¹ + ₁₅C₂ (0.24)² (0.76)¹⁵⁻²

P = ₁₅C₀ (0.76)¹⁵ + ₁₅C₁ (0.24)¹ (0.76)¹⁴ + ₁₅C₂ (0.24)² (0.76)¹³

The correct answer is When P = ₁₅C₀ (0.76)¹⁵ + ₁₅C₁ (0.24)¹ (0.76)¹⁴ + ₁₅C₂ (0.24)² (0.76)¹³

                     P = nCr pʳ qⁿ⁻ʳ

                    So that Here, n = 15, p = 0.24, and q = 0.76.

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Answer:

Her brother has 33 video games

Step-by-step explanation:

You take 15 plus 18 because hailey has 15 stuffed animals and her brother has 18 more video games then she has animals so you add 15+ 18 to get your final answer of 33 video games

The number of video games Hailey brother is having will be equal to 93.

Mathematical expressions with two algebraic symbols on either side of the equal (=) sign are called equations.

This relationship is illustrated by the left and right expressions being equal to one another. The left-hand side equals the right-hand side is a basic, straightforward equation.

As per the information given in the question,

Stuffed animals = 5 × dolls    (i)

Video games = 18 + stuffed animals      (ii)

Total number of dolls Hailey has is 15

Then, put this in equation (i)

Stuffed animals = 5 × 15

= 75

Now, put 75 in equation (ii)

Video games = 18 + 75

= 93

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The dimensions of lake are length 1.5 miles and width 0.3 miles

Solution:

Given that,

Artificial lake is in the shape of a rectangle

Let the length of lake be "a"

The width of the lake is 1/5 the length of the lake

[tex]width = \frac{length}{5}\\\\width = \frac{a}{5}[/tex]

The area of lake is 9/20 square miles

The area of rectangle is given by formula:

[tex]Area = length \times width[/tex]

Substituting the values we get,

[tex]\frac{9}{20} = a \times \frac{a}{5}\\\\a^2 = \frac{9}{20} \times 5\\\\a^2 = \frac{9}{4}\\\\\text{Taking square root on both sides }\\\\a = \frac{3}{2} = 1.5[/tex]

Thus, we get

[tex]length = a = 1.5 \text{ miles }\\\\width = \frac{a}{5} = \frac{1.5}{5} = 0.3 \text{ miles }[/tex]

Thus the dimensions of lake are length 1.5 miles and width 0.3 miles

The coordinates of point B that could be correct are (-2, 2) and (-3, 7). (option b and f)

Given that line AB is perpendicular to line BC, the product of their slopes will be -1. This means that the slope of line AB will be the negative reciprocal of the slope of line BC.

The slope of line BC can be calculated as

(7 - 2) / (2 - 2) = 5 / 0.

However, the denominator being zero implies that the slope is undefined, which contradicts the basic definition of a slope. This means that line BC is vertical, and its slope cannot be calculated.

Since line BC is vertical, line AB must be horizontal, and its slope is 0. Therefore, for a horizontal line passing through point A (-3, 2), any value of y will be 2. This means that the y-coordinate of point B must also be 2.

Let's analyze the options:

A. (8, 0): Incorrect y-coordinate.

B. (-2, 2): Correct y-coordinate.

C. (-4, 5): Incorrect y-coordinate.

D. (1, 3): Incorrect y-coordinate.

E. (-1, -1): Incorrect y-coordinate.

F. (-3, 7): Correct y-coordinate.

From the analysis, the correct coordinates for point B are (-2, 2) and (-3, 7).

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Answer:

17/24

Step-by-step explanation:

11/8 becomes 33/24

2/3 becomes 16/24

(33-16)/24 = 17/24

the answer is (-2,0)

Answer:

The scale factor is 2

Step-by-step explanation:

Scale factor  [tex]k=\frac{Image\: length}{Corresponding\:Object\:Length}[/tex]

[tex]k=\frac{|A'B'|}{|AB|}[/tex]

We can use the Pythagoras Theorem to get:

[tex]k=\frac{\sqrt{4^2+4^2} }{\sqrt{2^2+2^2}}[/tex]

[tex]k=\frac{\sqrt{2*4^2} }{\sqrt{2*2^2}}=\frac{4\sqrt{2} }{2\sqrt{2} } =2[/tex]

The scale factor is 2

Answer:

  C.  x = -4

Step-by-step explanation:

Graphing calculators make solving a problem like this very easy. The two functions both have the value -1 at x = -4.

The solution to f(x) = g(x) is x = -4.

Answer: the population in 2005 is

199393207

Step-by-step explanation:

The formula for exponential growth which is expressed as

A = P(1 + r/n)^ nt

Where

A represents the population after t years.

n represents the periodic interval at which growth is recorded.

t represents the number of years.

P represents the initial population.

r represents rate of growth.

From the information given,

P = 173 million

A = 178 million

t = 1997 - 1995 = 2 years

n = 1

Therefore

178 × 10^6 = 173 × 10^6(1 + r/1)^2 × 1

178 × 10^6/173 × 10^6 = (1 + r)^2

1.0289 = (1 + r)^2

Taking square root of both sides, it becomes

√1.0289 = √(1 + r)^2

1 + r = 1.0143

r = 1.0143 - 1 = 0.0143

Therefore, in 2005,

t = 2005 - 1995 = 10

A = 173 × 10^6(1 + 0.0143)^10

A = 173 × 10^6(1.0143)^10

A = 199393207

Answer:

Karla needs to bur 4 sandwiches.

Step-by-step explanation:

Given:

Amount of subway sandwich each person would get = [tex]\frac{1}{2}[/tex]

Number of people coming to watch football game = 7

Now given:

She wants to make sure each person,including herself,will get 1/2 of a subway sandwich.

Total number of people would watch the match = 8 persons

We need to find the number of sandwiches she need to buy.

Solution:

Now we know that;

to find the number of sandwiches she need to buy can be calculated by multiplying Amount of subway sandwich each person would get with Total number of people would watch the match.

framing in equation form we get;

the number of sandwiches she need to buy = [tex]\frac{1}{2}\times8 = 4[/tex]

Hence Karla needs to bur 4 sandwiches.

Answer:

  h = f(t) = -15cos((π/5)t) +20

Step-by-step explanation:

If you like, you can make a little table of positions:

  (t, h) = (0, 5), (5, 35)

Since the wheel is at an extreme position at t=0, a cosine function is an appropriate model:

  h = Acos(kt) +C

The amplitude A of the function is half the difference between the t=0 value and the t=5 value:

  A = (1/2)(5 -35) = -15

The midline value C is the average of the maximum and minimum:

  C = (1/2)(5 + 35) = 20

The factor k satisfies the relation ...

  k = 2π/period = 2π/10 = π/5

So, the function can be written as ...

  h = f(t) = -15cos((π/5)t) +20

The equation of the function of the height in meters above the ground t minutes after the wheel begins to turn, is presented as follows;

[tex]\mathbf{h = f(t) = 15 \cdot sin\left[ \left(\dfrac{\pi}{5} \right) \cdot (t - 2.5)\right] + 20}[/tex]

The process for finding the above function is as follows;

The given parameters of the Ferris wheel are;

The diameter of the Ferris wheel, D = 30 meters

The height of the Ferris wheel above the ground, d = 5 meters

The level of loading the platform = The six o'clock position

The time it takes the wheel to make one full revolution, T = 10 minutes

The required parameter;

The function which gives the height, h, of the Ferris wheel = f(t)

Method;

The equation that can be used to model the height of the Ferris wheel is the sine function which is presented as follows;

y = A·sin[k·(t - b)] + c

Where;

A = The amplitude = (highest point - Lowest point)/2

∴ A = (35 - 5)/2 = 15

The period, T = 2·π/k

∴ 10 minutes = 2·π/k

k = 2·π/10 = π/5

k = π/5

At the starting point, the Ferris wheel is at the lowest point, and t = 0, we have;

The sine function is at the lowest point when k·(t - b) = -π/2

Therefore, we get;

π/5·(0 - b) = -π/2

-b = -π/2 × (5/π) = -5/2 = -2.5

b = 2.5

The vertical shift, c = (Max - Min)/2 + Min = (Max + Min)/2

∴ c = (35 + 5)/2 = 20

c = 20

The equation of the Ferris wheel of the form, y = A·sin[k·(t - b)] + c, is therefore;

[tex]\mathbf{h = f(t) = 15 \cdot sin\left[ \left(\dfrac{\pi}{5} \right) \cdot (t - 2.5)\right] + 20}[/tex]

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Answer:

  CN = 7

Step-by-step explanation:

In the attached figure, we have drawn line CD parallel to AB with D a point on line MK. We know ΔMNT ~ ΔDCT by AA similarity, and because of the given angle congruence, both are isosceles with CD = CT. Likewise, we know ΔCDK is congruent to ΔBMK by AAS congruence, since BK = CK (given).

Then CD = BM (CPCTC). Drawing line NE creates isosceles ΔNEC ~ ΔTDC and makes CE = AB. Because ΔNEC is isosceles, CN = CE = AB = 7.

The length of segment CN is 7.

_____

If you assume CN is constant, regardless of the location of point N (which it is), then you can locate point N at B. That also collocates points T and K and makes ΔBMK both isosceles and similar to ΔBAC. Then CN=AB=7.

Answer: The answer is D

Step-by-step explanation:

Since the first digit must not be zero, and the first three digits must not be 900 or 800, the highest ten digits telephone number we can get is 899, since it is the highest number that is next in line to the forbidden numbers

The number of possible 10-digit telephone numbers, considering the given restrictions, is 638,000.

To find the number of possible 10-digit telephone numbers, we need to consider the restrictions given. The first digit cannot be zero, so there are 9 options for the first digit. The next 2 digits cannot be 800 or 900, so there are 8 options for each of these digits. The remaining 6 digits can be any number from 0 to 9, so there are 10 options for each of these digits.

Therefore, the total number of possible telephone numbers is 9 x 8 x 8 x 10 x 10 x 10 x 10 x 10 x 10 x 10 = 648,000. However, the number must end in 0000, so we subtract the cases where the last 4 digits are not all zeros. There are 10 options for each of these 4 digits, so there are 10 x 10 x 10 x 10 = 10,000 cases where the number does not end in 0000.

Therefore, the final number of possible telephone numbers is 648,000 - 10,000 = 638,000. The correct answer is B) 638,000.

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Answer:

[tex]25t+19\leq 144[/tex]

[tex]t\leq5[/tex]

The number of minutes she can continue to descend if she does not want to reach a point more than 144 feet below the ocean surface is at most 5 minutes.

Step-by-step explanation:

Given:

Initial depth of the scuba dive = 19 ft

Rate of descent = 25 ft/min

Maximum depth to be reached = 144 ft

Now, after 't' minutes, the depth reached by the scuba dive is equal to the sum of the initial depth and the depth covered in 't' minutes moving at the given rate.

Framing in equation form, we get:

Total depth = Initial Depth + Rate of descent × Time

Total depth = [tex]19+25t[/tex]

Now, as per question, the total depth should not be more than 144 feet. So,

[tex]\textrm{Total depth}\leq 144\ ft\\\\19+25t\leq 144\\\\or\ 25t+19\leq 144[/tex]

Solving the above inequality for time 't', we get:

[tex]25t+19\leq 144\\\\25t\leq 144-19\\\\25t\leq 125\\\\t\leq \frac{125}{25}\\\\t\leq 5\ min[/tex]

Therefore, the number of minutes she can continue to descend if she does not want to reach a point more than 144 feet below the ocean surface is at most 5 minutes.

Answer:

The rider is 15.91  seconds  50 ft above the ground after reaching the low point

Step-by-step explanation:

We can evaluate the angle  α

using trigonometry applied to the orange small triangle with height 50-30 = 20 ft and  hypotenuse equal to the radius  r = 25ft

Now

[tex]20 = \frac{25}{sin(\alpha)}[/tex]

[tex]\alpha = arcsin{\frac{20}{25}[/tex]

[tex]\alpha = 53.13^{\circ}[/tex]

So  50 ft  of height corresponds to the total angle:

[tex]90^{\circ} =53.13^{\circ} = 143.13 6^{\circ}[/tex]  = 2.498 radians

Now the angular velocity

[tex]\omega = \frac{2\pi}{T}[/tex]

[tex]\omega = \frac{2 \pi}{40}[/tex]

[tex]\omega =0.157rad/s[/tex]

To describe  2.498  rad  it will take:

[tex]t = \frac{2.498}{0.157}[/tex]

t = 15.91 s

The rider reaches 50 feet above the ground approximately 4.09 seconds after reaching the lowest point.

To solve the problem of determining how long after reaching the low point a rider on the Ferris wheel is 50 feet above the ground, we can follow these steps:

Step 1: Define the parameters

Diameter of the Ferris wheel: 50 feet.

Radius of the Ferris wheel: [tex]\( r = \frac{50}{2} = 25 \)[/tex] feet.

Center of the wheel height: 30 feet above the ground.

Rotation period: 40 seconds per revolution.

Step 2: Establish the equation for the height of a rider

The vertical position ( h(t) ) of a rider at time ( t ) seconds can be modeled using the cosine function (assuming the lowest point at ( t = 0 ):

[tex]\[ h(t) = 30 + 25 \cos\left(\frac{2\pi t}{40}\right) \][/tex]

Step 3: Set the height equation to 50 feet

Since we want the height h(t) to be 50 feet:

[tex]\[ 50 = 30 + 25 \cos\left(\frac{2\pi t}{40}\right) \][/tex]

Step 4: Solve for the cosine term

[tex]\[ 50 = 30 + 25 \cos\left(\frac{2\pi t}{40}\right) \][/tex]

[tex]\[ 20 = 25 \cos\left(\frac{2\pi t}{40}\right) \][/tex]

[tex]\[ \cos\left(\frac{2\pi t}{40}\right) = \frac{20}{25} \][/tex]

[tex]\[ \cos\left(\frac{2\pi t}{40}\right) = 0.8 \][/tex]

Step 5: Determine the angle

[tex]\[ \frac{2\pi t}{40} = \cos^{-1}(0.8) \][/tex]

[tex]\[ \frac{2\pi t}{40} = 0.6435 \][/tex]

[tex]\[ t = \frac{0.6435 \times 40}{2\pi} \][/tex]

[tex]\[ t \approx 4.09 \text{ seconds} \][/tex]

Thus, the rider reaches 50 feet above the ground approximately 4.09 seconds after reaching the lowest point.

Answer:

  8

Step-by-step explanation:

We assume there are 2 bushings per bolt, and 2 bolts per spring. Whether you count springs and multiply by 2, or count bushings and divide by 2, you get 8 eyebolts.

_____

Comment on the question

There are conceivable mechanical arrangements in which the number of eyebolts might be some other number. There is not actually enough information here to properly answer the question.

To replace all the bushings in a Jeep YJ, a total of 8 leaf spring eyebolts would be required considering each spring uses two eyebolts.

To be able to replace all the bushings in your Jeep YJ's leaf springs, you need to first establish how many leaf spring eyebolts you will need. In a standard leaf spring setup, each end of the spring (both front and back) is held in place by a leaf spring eyebolt. Since you have 4 springs and each spring uses 2 leaf spring eyebolts (one for the front leaf spring eye and one for the back), you'll require a total of 8 leaf spring eyebolts for your Jeep YJ.

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The hockey player must score 20 goals in order to make the same money as the first contract

Solution:

Given that, hockey player is offered two options for a contract

Let "x" be the number of goals made

A base salary of 50,000 and 1000 per goal

Therefore, money earned is given as:

Money earned = 50000 + 1000(number of goals)

Money earned = 50000 + 1000x ------- eqn 1

Base salary of 40,000 and 1500 per goal

Therefore, money earned is given as:

Money earned = 40000 + 1500(number of goals)

Money earned = 40000 + 1500x --------- eqn 2

In order to make the same money as the other contract, eqn 1 must be equal to eqn 2

50000 + 1000x = 40000 + 1500x

1500x - 1000x = 50000 - 40000

500x = 10000  

x = 20

Thus he must score 20 goals in order to make the same money as the first contract

Answer:

length 8 feet and width 8 feet

Step-by-step explanation:

Lets x  be the length and width of the sheet

An open box is to be constructed from a square piece of sheet metal by removing a square of side 2 feet from each corner

so height is 2 feet

length of the box is x-4 feet

width of the box is also x-4 feet

Volume of the box is length times width times height

[tex]V= (x-4)(x-4)2[/tex]

[tex]32=2 (x-4)^2[/tex]

divide both sides by 2

[tex]16=(x-4)^2[/tex]

take square root on both sides

[tex]4=x-4[/tex]

Add 4 on both sides

[tex]x=8[/tex]

So dimension of the sheet is

length 8 feet and width 8 feet

Answer:12cm

Step-by-step explanation:

The ratio are:

4:6:9

Perimeter=57cm

Let a be the unknown value.

The triangle has three sides: 4a, 6a, 9a

Perimeter=The sum of three sides

57=4a + 6a +9a

57=19a

Divide both side by 19

a=57/19

a=3

Therefore

4a:6a:9a

4×3:6×3:9×3

12:18:27

So the shortest side is 12cm

Final answer:

The shortest side of the triangle is found by setting up the sides as a proportion with a common multiplier and using the given perimeter to solve for it. Upon finding the multiplier, we multiply it by the smallest ratio to find the shortest side, which is 12 cm.

Explanation:

To solve for the length of the shortest side of the triangle, we should initially set up the ratio of the sides as 4x:6x:9x, where x is the common multiplier for each side of the triangle. Since the perimeter of the triangle is given as 57 cm, we can write the equation 4x + 6x + 9x = 57 to represent the sum of the sides of the triangle. This simplifies to 19x = 57, and by dividing both sides of the equation by 19, we find that x = 3. Therefore, the shortest side of the triangle, represented by 4x, will be 4 × 3 = 12 cm.

Answer:

(1,-5)

Step-by-step explanation:

recall that for any function g(x), we can equate the function to y,

i.e y = g(x), where any point (x,y) that satisfies the equation is considered a point on the graph

in our case we are given, that g(1) = -5, rearranging:

-5 = g(1)

if we compare this with the the equation above y = g(x),

we can see clearly that y = -5 and x = 1.

and from our reasoning given in the paragraph above, we can say that (1,-5) is a point on the graph.

Answer:

  -5, multiplicity 3; +9, multiplicity 2; -1

Step-by-step explanation:

The roots of f(x) are those values of x that make the factors be zero. For a factor of x-a, the root is x=a, because a-a=0. If the factor appears n times, then the root has multiplicity n.

f(x) = (x+5)^3(x-9)^2(x+1) has roots ...

Answer:

a. -5 with multiplicity 3

d. 9 with multiplicity 2

f.  -1 with multiplicity 1

Step-by-step explanation:

edge

Answer:

  29

Step-by-step explanation:

Let c, r, g stand for the current ages of Carolina, Raul, and Ginny. Then we have the relations ...

  c = 2r

  g = 3r +4

  c + r + g = 52

Substituting for c and g, we get ...

  2r + r + (3r +4) = 52

  6r = 48 . . . . . . . . . . . . . subtract 4

  r = 8 . . . . . . . . . . . . . . . divide by 8

  g = 3(8) +4 = 28 . . . . . .Ginny is presently 28

On Ginny's next birthday, she will be 29.

Answer: Ginny would be 29 years old on her next birthday.

Step-by-step explanation:

Let c represent Carolina's current age.

Let r represent Raul's current age.

Let g represent Ginny's current age.

Carolina is twice as old as Raul. It means that

c = 2r

Ginny is the oldest and is three times Raul's age plus four. It means that

g = 3r + 4

Their ages add up to be 52. It means that

c + r + g = 52 - - - - - - - - - - - - 1

Substituting

c = 2r and g = 3r + 4 into equation 1, it becomes

2r + r + 3r + 4 = 52

6r + 4 = 52

6r = 52 - 4 = 48

r = 48/6 = 8

c = 2r = 2 × 8

c = 16

g = 3r + 4 = 3 × 8 + 4

g = 24 + 4 = 28

On Ginny's next birthday, she would be 28 + 1 = 29 years old

Answer: E. Parametric estimating

Step-by-step explanation:                          

A parametric estimate is the estimating process that uses a statistical relationship between past project's data and other variables to give an estimation for the parameters such as duration ,cost and budget.

It is based on parameters that summarize the risk , costs of algorithm , project , process , complexity and service.

It can create a greater level of accuracy.

Therefore , Parametric estimating is an estimating technique that uses a statistical relationship between historical data and other variables to calculate an estimate for activity parameters such as duration and cost.

Hence , the correct answer is E. Parametric estimating.

Answer:

A binomial probability density function should be used because the question asks for determining the probability that exactly 10 students wear glasses.

Step-by-step explanation:

A binomial probability density function is used when we want to know the probability of an exact value.

A cumulative distribution function is used when we want to know the probability of less than or equal to a value.

Answer:

10.6 feet

Step-by-step explanation:

Length = 22ft

width= 14ft

Maximum area = 800 sq. ft

Let X be increase in the number of feet for the length and width.

The new length = (22 + x) ft

New width= (14 + x) ft

Area = (22+x)(14+x) ≤ 800

308 + 36x + x^2 ≤ 800

x^2 + 36x + 308 - 800 ≤ 0

x^2 + 36x - 492 ≤ 0

Solve using quadratic equation

x = (-b +/- √b^2 - 4ac) / 2a

a= 1, b = 36, c= 492

x = (-36 +/- √36^2 - 4*1*-492)/ 2*1

= (-36 +/- √1396 + 1968) / 2

= (-36 +/- √3264) / 2

= (-36 +/- 57.13) / 2

x = (-36 + 57.13)/2 or (-36 - 57.13)/2

x = 21.13/2 or -93.13/2

x = 10.6 or -31.0

x = 10.6 ft

The length and width must increase by 10.6 ft each

The number of whole feet by which the length and width of the deck can be increased would be calculated by setting up and solving an equation taking into account the original dimensions and maximum allowed area for the deck.

The question is asking to find by how many whole feet the length and width of the rectangular deck can be increased, given a maximum area limit set by the building code. Let's suppose x is the number of feet by which both the length and width are to be increased. Given that the original area of the deck is 14 feet by 22 feet (which gives an area of 308 square feet), the new dimensions would be (14 + x) feet by (22 + x) feet.

According to the building code, the maximum area allowed for the deck is 800 square feet. We can write and solve the following equation to find x: (14 + x) * (22 + x) = 800.

Solving this equation would yield the maximum integral number of feet each dimension can be increased while still not exceeding the allowed 800 square feet.

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Answer:

YES!!!

Step-by-step explanation:

Answer:

Your answer is going to be C

Step-by-step explanation:

So, when it is on the top, your X will always be first and you can see it is not in the negatives. When it is on the bottom Y is first and you can see it is in the negatives.

Answer:

  -4 ≤ y < ∞

Step-by-step explanation:

The graph shows the range (vertical extent) has a minimum value of -4, and includes all y-values greater than or equal to that value.

In interval notation, the range is [-4, ∞).

Answer:

  about $525,900

Step-by-step explanation:

Each year, the value is multiplied by (1 +4%) = 1.04. After 20 years, it will have been multiplied by that value 20 times. That multiplier is 1.04^20 ≈ 2.19112314.

The value of the house in 20 years will be about ...

  $240,000×2.19112314 ≈ $525,900 . . . . . rounded to hundreds

Answer: it would be worth $52587 in 20 years.

Step-by-step explanation:

If the value of the house increases at a rate of 4% per year, then the rate is exponential. We would apply the formula for exponential growth which is expressed as

A = P(1 + r/n)^ nt

Where

A represents the value of the house after t years.

n represents the period of increase.

t represents the number of years.

P represents the initial value of the house.

r represents rate of increase.

From the information given,

P = $24000

r = 4% = 4/100 = 0.04

n = 1 year

t = 20 years

Therefore

A = 24000(1 + 0.04/1)^1 × 20

A = 24000(1.04)^20

A = $52587

Answer: a) 0.0001, b) 0.0081.

Step-by-step explanation:

Since we have given that

Probability that a person will make a mistake on their state income tax return = 0.1

Probability that a person will not make any mistake = [tex]1-0.1=0.9[/tex]

Since the events are independent.

So, (a) four totally unrelated persons each make a mistake;

Our probability becomes,

[tex]P(A\cap B\cap C\cap D)=P(A)\times P(B)\times P(C)\times P(D)\\\\=0.1\times 0.1\times 0.1\times 0.1\\\\=0.0001[/tex]

(b) Mr. Jones and Ms. Clark both make mistakes, and Mr. Roberts and Ms. Williams do not make a mistake.

So, our probability becomes,

[tex]P(A\cap B\cap C'\cap D')=P(A)\times P(B)\times P(C')\times P(D')\\\\=0.1\times 0.1\times 0.9\times 0.9\\\\=0.0081[/tex]

Hence, a) 0.0001, b) 0.0081.

Final answer:

The probability that four unrelated persons each make a mistake on their tax returns is 0.0001. The probability that Mr. Jones and Ms. Clark both make mistakes, while Mr. Roberts and Ms. Williams do not, is 0.0081, calculated by multiplying the individual probabilities of each event.

Explanation:

The probability of independent events occurring simultaneously is calculated by multiplying the probabilities of each individual event. For part (a), we need to find the probability that four totally unrelated persons each make a mistake on their tax returns. Since the probability of one person making a mistake is 0.1, and the events are independent, we multiply this probability four times.

Probability (four unrelated persons each make a mistake) = 0.1x0.1x0.1x0.1 = 0.0001

For part (b), we are looking for the probability that Mr. Jones and Ms. Clark both make mistakes, while Mr. Roberts and Ms. Williams do not make mistakes. The probability of making a mistake is 0.1 and not making a mistake is 0.9 (which is 1 - 0.1).

Probability (Jones and Clark make mistakes, Roberts and Williams do not) = 0.1x0.1x0.9x0.9 = 0.0081

Answer:

256 boys.

Step-by-step explanation:

Let x represent number of boys in the course.

We have been given that there are 416 students who are enrolled in an introductory Chinese course. There are eight boys to every five girls.

We will use proportions to find the total number of boys in the course.

Since there are eight boys to every five girls, so there are 8 boys for 13 (8+5) total students.

[tex]\frac{\text{Boys}}{\text{Total students}}=\frac{8}{13}[/tex]

Upon substituting our values in above equation, we will get:

[tex]\frac{x}{416}=\frac{8}{13}[/tex]

Multiply both sides by 416:

[tex]\frac{x}{416}*416=\frac{8}{13}*416[/tex]

[tex]x=8*32[/tex]

[tex]x=256[/tex]

Therefore, there are 256 boys in the course.

Final answer:

To calculate the number of boys in a class with a given ratio of boys to girls, divide the total number of students by the sum of the parts of the ratio to find one part's value, then multiply by the number of parts for boys. In this case, with 416 students and a ratio of 8 boys to 5 girls, there are 256 boys enrolled in the course.

Explanation:

Calculating the Number of Boys and Girls in a Class

To find the number of boys in an introductory Chinese course with a ratio of eight boys to every five girls, we can use the concept of ratios and proportions. Given that there are 416 students enrolled in the course, we first add the parts of the ratio together, which gives us 8 (boys) + 5 (girls) = 13 parts in total. The number of boys can then be calculated as follows:

Divide the total number of students by the total number of parts to find the value of one part: 416 students ÷ 13 parts = 32 students per part.

Multiply the value of one part by the number of parts attributed to the boys: 32 students per part × 8 parts (for boys) = 256 boys.

Therefore, based on the ratio provided, there are 256 boys enrolled in the introductory Chinese course.