Solve the following pair of equations by substitution method:
0.2x + 0.3y − 1.1 = 0, 0.7x − 0.5y + 0.8 = 0

Lillian would have approximately $14,599 in her account after 3 years, to the nearest dollar.

To find out how much Lillian would have in her account after 3 years, we need to use the future value of a series formula, which is:

[tex]FV = P \frac{(1 + r)^nt - 1)}{r}[/tex]

where:
FV = future value of the series
P = monthly deposit ($430)
r = monthly interest rate (annual interest rate / 12)
n = number of times interest is compounded per year (12)
t = number of years (3)

First, we need to find the monthly interest rate by dividing the annual interest rate (4.5%) by 12:
[tex]r =\frac{0.045}{12} = 0.00375[/tex]

Now we can plug the values into the formula:
[tex]FV = 430 \frac{(1 + 0.00375)^{12x3}  - 1)}{0.00375}[/tex]

Calculating the future value:
[tex]FV = 430\frac{(1.127334 - 1) }{0.00375} = 430 \frac{0.127334}{ 0.00375} = 430 (33.955)[/tex]
[tex]FV =14,598.65[/tex]

So, Lillian would have approximately $14,599 in her account after 3 years, to the nearest dollar.

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We know that the indicated probability is approximately 0.1210.

To use the normal approximation, we need to check if the conditions for a normal approximation are met. In this case, we have:

np = 81 * 0.5 = 40.5 ≥ 10
n(1-p) = 81 * 0.5 = 40.5 ≥ 10

Since both conditions are met, we can use the normal approximation to find the probability.

First, we need to find the mean and standard deviation of the sampling distribution of sample proportions:

mean = np = 81 * 0.5 = 40.5
standard deviation = sqrt(np(1-p)) = sqrt(81 * 0.5 * 0.5) = 4.5

Next, we need to standardize the value of x:

z = (x - mean) / standard deviation
z = (46 - 40.5) / 4.5 = 1.22

Finally, we can use a standard normal table or calculator to find the probability:

P(z ≥ 1.22) = 0.1118

Therefore, the answer is approximately 0.1210.

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The probability that a student at Kennedy High School plays on the football team given that they already play in the band is 2/1 or simply 2.

To solve this problem, we can use conditional probability. We want to find the probability that a student plays on the football team given that they already play in the band.

Let's use the formula for conditional probability:

P(Football | Band) = P(Football and Band) / P(Band)

We know that P(Band) = 0.15, and P(Football and Band) = 0.3.

So,

P(Football | Band) = 0.3 / 0.15

Simplifying, we get:

P(Football | Band) = 2

Therefore, the probability that a student at Kennedy High School plays on the football team given that they already play in the band is 2/1 or simply 2.

Note: This answer may seem unusual because probabilities are typically expressed as fractions or decimals between 0 and 1. However, in this case, we can interpret the result as saying that students who play in the band are twice as likely to also play on the football team compared to the overall population of students.

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Step-by-step explanation:

= sqrt ( 28 ÷7) = sqrt (4) = 2

Answer:

2

Step-by-step explanation:

First we put the two equations together so it would be like this

[tex]\sqrt \frac{28}{7}[/tex]

the square root of that is 4 because 7 goes into 28 four times

so now we have this [tex]\sqrt{4}[/tex]

and the square root of 4 is 2

Curtis started with 84 cards and now has 12 cards at home and 9 cards at school, for a total of 21 cards.

To find how many card ,We see Curtis has 9 cards at school after trading with Dino again, which means he had 12 cards before the trade.

Before his mom bought him another pack of 12 cards, he had 10 missing, so he must have had 24 cards in total (12 + 12).

He hid half of his cards at home, so he has 12 cards at home.

He traded ¼ of the cards he brought to school to Dino and got back 3 of Dino's cards. Let's call the number of cards he brought to school "x".

So, he traded x/4 cards to Dino, and got back 3 cards, which means he now has (x/4) - 3 cards.

We know that he now has 9 cards at school, so we can set up an equation:

(x/4) - 3 = 9

Solving for x, we get:

x/4 = 12

x = 48

So, Curtis brought 48 cards to school, which means he started with 24 + 12 + 48 = 84 cards in total.

Therefore, Curtis started with 84 cards and now has 12 cards at home and 9 cards at school, for a total of 21 cards.

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Answer:

Read

Step-by-step explanation:

If Alex can stack exactly 16 cookies with a diameter of 5 cm inside a cylindrical container with the same diameter, then the height of the cylinder will be equal to the height of 16 cookies stacked on top of each other, which is 16 multiplied by the height of one cookie.

The diameter of each cookie is 5 cm, so the radius is 2.5 cm. The volume of each cookie is πr²h, where r is the radius and h is the height, so the volume of one cookie is:

V1 = π(2.5 cm)²h

The volume of 16 cookies will be:

V16 = 16π(2.5 cm)²h

Since the volume of the cylindrical container is 100% cm³, we have:

V16 = Vcyl

where Vcyl is the volume of the cylindrical container. Therefore:

16π(2.5 cm)²h = Vcyl

The height of 16 cookies stacked on top of each other is 16 times the height of one cookie, so:

h = 16(1 cm) = 16 cm

Substituting this value into the equation above and solving for the radius, we get:

r = √(Vcyl / (16πh)) = √(100 cm³ / (16π(16 cm))) ≈ 1.03 cm

The surface area of the cylindrical container is given by the formula:

A = 2πr² + 2πrh

Substituting the values we found for r and h, we get:

A = 2π(1.03 cm)² + 2π(1.03 cm)(16 cm) ≈ 142 cm²

Therefore, the surface area of the container is approximately 142 square centimeters. Rounded to the nearest square centimeter, the answer is 142 square centimeters.

The surface area of the given cylindrical container is 290 cm².

The volume of a cylinder is given by the formula:

V = πr²h

where r is the radius of the cylinder and h is its height.

We know that the volume of the cylindrical container is 100π cm³ and that it has the same diameter as the cookies, which is 5 cm.

Since the diameter of the container is 5 cm, its radius is 2.5 cm.

We can rearrange the formula for volume to solve for

h = V/πr²

h = 100π/π(2.5)²

h = 16

So, the height of the container is 16 cm.

To find the surface area of the container, we can use the formula:

A = 2πrh + 2πr²

where r is the radius of the container and h is its height.

Substituting the values we have, we get:

A = 2π(2.5)(16)+2π(2.5)²

A = 92.5π

A ≈ 290.45

Rounding to the nearest square centimeter,

A = 290

Thus, the surface area of the container is 290 cm².

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Answer:

P(t)=26.5 (0.1)^t

Step-by-step explanation:

To find the percentage of plants that are exactly 13cm tall using a proportion, you need to first identify the number of plants that are 13cm tall and the total number of plants. Based on your question, let's assume that 2 out of 9 plants are exactly 13cm tall.

Now, set up a proportion with the given information:

(number of plants 13cm tall) / (total number of plants) = (x) / (100)

In this case, the proportion is:
2/9 = x/100

To solve for x, cross-multiply:
2 * 100 = 9 * x
200 = 9x

Now, divide both sides by 9:
x = 200 / 9
x ≈ 22.22
So, approximately 22.22% of the plants in Dorothy's garden are exactly 13cm tall.

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The speed of the faster car is 90 kph and the speed of the slower car is 45 kph.

We are given that two cars are starting together and they travel in the same direction. Let one car be car A and the other car B. Speed of car B is twice the speed of car A. Let r be the rate of speed of car A and 2r be the rate of speed of car B.

We know that these two cars are 225 km apart. We will use the formula distance = speed * time. Let the distance car A travels after 5 hours be 5r. So, the distance traveled by car B after 5 hours will be 5(2r) = 10r.

Since car B is faster, it will have traveled farther after 5 hours. Therefore,

Distance traveled by car B - distance traveled by car A = 225

10r - 5r = 225

5r = 225

r = 45 kph

and

2r = 90 kph

Therefore, car A is traveling at 45 kph and car B is traveling at 90 kph.

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Answer:

$15.92

Step-by-step explanation:

We Know

2 liters of Gatorade cost $3.98

How much do 8 liters cost?

We take

3.98 x 4 = $15.92

So, 8 liters cost $15.92

Mike's bonus for the year is between $15,000 and $19,500.

The inequality that best represents Mike's bonus, B, for the year is:

$15,000 [tex]\leq B \leq[/tex] 19,500$

to see why, we are able to use the given data that Mike's bonus is calculated as 3 percent of his corporation's overall profits.

If we let P be the organization's general income, then Mike's bonus B can be expressed as:

$B = 0.03P$

We recognise that the organization's total profits are between $500,000 and $650,000, so we will write:

$500,000 [tex]\leq P \leq[/tex] 650,000$

Substituting this inequality into the equation for Mike's bonus, we get:

$15,000 [tex]\leq B \leq[/tex] 19,500$

Therefore, Mike's bonus for the year is between $15,000 and $19,500.

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The cost of points for this mortgage is $3,510 rounded to the nearest dollar if Julie pays 2.25 points.

Cost of house =  $225,000.

Mortgage amount =  $156,000

Fixed-rate = 4.5%

Bank offer rate = 4.25%

Points to pay = 2.25 points

If we assume that one point is equal to 1%, then 2.25 points are equal to 2.25% of the loan amount.

The cost of points for the mortgage can be calculated by the product of the loan amount by 2.25%.

Cost of points = 0.0225 × $156,000

Cost of points = $3,510

Therefore, we can conclude that the cost of points for this mortgage is $3,510 rounded to the nearest dollar.

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The reflection of the point P = (-4, 7) in the y-axis is (4, 7).

We have,

To find the reflection of a point P in the y-axis, negate the x-coordinate of the point while keeping the y-coordinate unchanged.

Given that P = (-4, 7),

The reflection of P in the y-axis, denoted as [tex]R_{y-axis}(P),[/tex] can be found by negating the x-coordinate:

[tex]R_{y-axis}(P) = (4, 7)[/tex]

Thus,

The reflection of the point P = (-4, 7) in the y-axis is (4, 7).

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The complete question:

If p = (-4, 7)

R_{y-axis} (P) = ?

Size of triangles doesn't determine slope, mq slope=-2, qs slope=-0.5

Mollie's claim is incorrect because the size of the triangles does not determine the slope of a line. The slope is calculated by dividing the change in the y-coordinates by the change in the x-coordinates between two points on the line. Therefore, we need to find two points on the lines mq and qs to calculate their slopes.

Let's start by finding the slope of mq. We can identify two points on the line, (0,6) and (2,2). Using these points, we can calculate the slope as:

slope of mq = (change in y-coordinates) / (change in x-coordinates)

slope of mq = (2 - 6) / (2 - 0)

slope of mq = -4 / 2

slope of mq = -2

Now let's find the slope of qs. We can identify two points on the line, (2,2) and (6,0). Using these points, we can calculate the slope as:

slope of qs = (change in y-coordinates) / (change in x-coordinates)

slope of qs = (0 - 2) / (6 - 2)

slope of qs = -2 / 4

slope of qs = -0.5

Therefore, the slope of mq is -2 and the slope of qs is -0.5.

In summary, Mollie's claim is incorrect because the size of the triangles does not determine the slope of a line. We calculated the slopes of lines mq and qs by finding two points on each line and using the formula for slope, which is the change in y-coordinates divided by the change in x-coordinates. The slope of mq is -2, and the slope of qs is -0.5.

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Answer:

The expression 625y^2 + 400y - 36 + 20z - z^2 can be rearranged and simplified as follows:

625y^2 + 400y - 36 + 20z - z^2

= (25y)^2 + 2(25y)(8) + 8^2 - 8^2 - 36 + 20z - z^2 (adding and subtracting (25y)(8) and 8^2 inside the parentheses)

= (25y + 8)^2 - (8^2 + 36) + 20z - z^2 (expanding the squared term and simplifying)

= (25y + 8)^2 - 100 + 20z - z^2 (simplifying)

Therefore, the simplified form of the expression is:

(25y + 8)^2 - 100 + 20z - z^2.

Note that this expression can also be written as:

(5y + 2)^2(5y - 12)^2 - (z - 10)(z + 10),

Using the difference of squares factorization. However, this is not necessarily simpler than the previous form, and it depends on the context and the purpose of the expression.

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The correct equation to determine the number of people (p) who can go to the amusement park is: 100.25 = 13.75p + 17.75.

Here's the step-by-step explanation:

1. The total amount they have to spend is $100.25.
2. The cost of parking is $17.75, which is a one-time expense.
3. The cost of admission per person is $13.75.

To find out how many people can go, you need to account for both the parking cost and the cost of tickets for each person. Therefore, the equation is:

100.25 (total amount) = 13.75p (cost per person times the number of people) + 17.75 (cost of parking)

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Frank's monthly credit card payment for consolidating his credit cards will be $467.29.

Option C is the correct answer.

We have,

To calculate the monthly credit card payment for consolidating Frank's credit cards, we can use the formula for the monthly payment on a loan:

[tex]M = P (r (1 + r)^n) / ((1 + r)^n - 1),[/tex]

where M is the monthly payment, P is the total loan amount (sum of all credit card balances), r is the monthly interest rate, and n is the number of months.

First, let's calculate the total loan amount:

Total loan amount = $2,380 + $4,500 + $1,580 + $900 = $9,360.

Next, let's calculate the monthly interest rate:

Monthly interest rate = APR / 12 = 18% / 12 = 1.5%.

Now, let's calculate the monthly payment using the formula:

[tex]M = $9,360 \times (0.015 (1 + 0.015)^{24}) / ((1 + 0.015)^{24} - 1).[/tex]

Using a calculator, we can compute the value of M:

M ≈ $467.286.

Rounding to the nearest cent,

Frank's monthly credit card payment for consolidating his credit cards will be $467.29.

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The equation in slope-intercept form that models the total cost of attendance is: y = 2,633x + 275.


1. Add up the annual costs: tuition and fees ($4,934), room and board ($1,424), and cost of books and supplies ($1,250) to get the total annual cost: $4,934 + $1,424 + $1,250 = $7,608.

2. Subtract the annual scholarship and grants from the total annual cost: $7,608 - $5,250 = $2,358. This is the slope (x) of the equation, as it represents the cost per year.

3. The other one-time fee ($275) is the y-intercept of the equation, as it's a fixed cost that does not change with the number of years.

4. Put the slope and y-intercept into the slope-intercept form (y = mx + b) to get: y = 2,633x + 275.

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The total amount deducted from her gross income health and disability insurance during each pay period is $72.50.

To calculate the total amount deducted from Asako's gross income for health and disability insurance during each pay period, we need to first determine the cost of each insurance plan after the employer's coverage.

For the $3,500 per year disability insurance plan, Asako's employer covers 90% of the cost, which means Asako is responsible for 10% of the cost.

10% of $3,500 is $350, so Asako's cost for the $3,500 per year disability insurance plan is $350 per year.

For the $1,300 per year disability insurance plan, Asako's employer covers 60% of the cost, which means Asako is responsible for 40% of the cost.

40% of $1,300 is $520, so Asako's cost for the $1,300 per year disability insurance plan is $520 per year.

Since Asako gets paid monthly, we need to divide the annual cost of each insurance plan by 12 to determine the cost per pay period.

For the $3,500 per year disability insurance plan, Asako's cost per pay period is $350 / 12 = $29.17.

For the $1,300 per year disability insurance plan, Asako's cost per pay period is $520 / 12 = $43.33.

Therefore, the total amount deducted from Asako's gross income for health and disability insurance during each pay period is $29.17 + $43.33 = $72.50.

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When i (x) = 3, the value of y is approximately -6.67. The equation relating i (x) and y in this inverse variation is xy = -20.

The given information states that the variables x and y vary inversely. To write an equation relating i (assuming it's x) and y, we first need to understand the concept of inverse variation.

In inverse variation, the product of the two variables remains constant. Mathematically, it can be represented as xy = k, where k is the constant of variation. We are given the values i (x) = 5 and y = -4. Using these values, we can find the constant of variation, k:

5 * -4 = k
k = -20

Now that we have the constant of variation, we can write the equation relating i (x) and y as:

xy = -20

Next, we want to find the value of y when i (x) = 3. We can use the equation we just derived to find the value of y:

3 * y = -20

Now, we can solve for y:

y = -20 / 3
y ≈ -6.67

So, when i (x) = 3, the value of y is approximately -6.67. The equation relating i (x) and y in this inverse variation is xy = -20.

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The lowest score that would achieve an A is 10.

To find the lowest score that would achieve an A, we need to find the score corresponding to the 7th percentile of the distribution of scores.

First, we need to find the z-score corresponding to the 7th percentile. We can use a z-table or a calculator to find this value.

The z-score corresponding to the 7th percentile is approximately -1.44. This means that a score at the 7th percentile is 1.44 standard deviations below the mean.

We can use the formula for z-score to find the raw score corresponding to this z-score:

z = (x - μ) / σ

where z is the z-score, x is the raw score, μ is the mean, and σ is the standard deviation.

Plugging in the values we have:

-1.44 = (x - 46) / 25

Multiplying both sides by 25:

-36 = x - 46

Adding 46 to both sides:

x = 10

Therefore, the lowest score that would achieve an A is 10.

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Answer:

  u = -2.34  or  u = 18.34

Step-by-step explanation:

You want to solve u² -16u = 43 by completing the square.

To complete the square, add the square of half the coefficient of the linear term to both sides.

  u² -16u +(-16/2)² = 43 +(-16/2)²

  u² -16u +64 = 107 . . . . . . . simplify

  (u -8)² = 107 . . . . . . . . . write as a square

  u -8 = ±√107 . . . . . . square root

  u = 8 ± √107  . . . add 8

  u = -2.34  or  u = 18.34 . . . . . find the decimal values

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The solution to the given initial value problem is (d) y = 4x^(1/4) - 1.

Given the initial value problem,

dy/dx = 4x^(-3/4), y(1) = 3

Integrating both sides with respect to x, we get

∫dy = ∫4x^(-3/4)dx

y = -8x^(-1/4) + C

where C is the constant of integration.

To find the value of C, we use the initial condition y(1) = 3

3 = -8(1)^(-1/4) + C

C = 3 + 8 = 11

Therefore, the solution to the initial value problem is

y = -8x^(-1/4) + 11

Simplifying further,

y = 11 - 8/x^(1/4)

Hence, the correct option is d) y = 4x^(1/4) - 1 is not the solution to the given initial value problem.

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By using Numerical integration method such as Simpson's rule or Monte Carlo simulation, we will get the area

To calculate the area of surface S, we first need to find the limits of integration. The paraboloid hyperbolic is located between the cylinders x + y = 1 and x = 2. This means that the limits of integration for x are 1 and 2, and for y they are -sqrt(4-[tex]x^2[/tex]) and sqrt(4-[tex]x^2[/tex]).

Calculation of area:
Using the formula for the surface area of a paraboloid hyperbolic, which is given by:
A = 2π ∫∫ (1 + (∂z/∂x[tex])^2[/tex] + (∂z/∂y[tex])^2[/tex][tex])^{(1/2)[/tex] dA
We can calculate the area of surface S. First, we need to find the partial derivatives of z with respect to x and y:
∂z/∂x = -2x/(2+[tex]y^2[/tex])
∂z/∂y = -2y/(2+[tex]x^2[/tex])
Substituting these values into the formula for surface area, we get:
A = 2π ∫[tex]1^2[/tex] ∫-sqrt(4-[tex]x^2[/tex])^sqrt(4-[tex]x^2[/tex]) (1 + (-2x/(2+y^2)[tex])^2[/tex]+ (-2y/(2+[tex]x^2)[/tex][tex])^2[/tex][tex])^{(1/2)[/tex]dydx
Using a numerical integration method such as Simpson's rule or Monte Carlo simulation, we can calculate this integral to get the area of surface S.

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Answer:

3 cm.

Step-by-step explanation:

Let's use the formula for the perimeter of a rectangle, which is P = 2l + 2w, where P is the perimeter, l is the length, and w is the width.In this case, we have:P = 16 cm (given)

l = k cm (given)

w = 5 cm (given)Substituting these values into the formula, we get:

16 cm = 2(k cm) + 2(5 cm)

Simplifying, we get:

16 cm = 2k cm + 10 cm

Subtracting 10 cm from both sides, we get:6 cm = 2k cm

Dividing both sides by 2, we get:

3 cm = k

Therefore, the value of k is 3 cm.

The investment grows to $4,493.29 at 2% interest, $4,558.56 at 3% interest, $4,625.05 at 4% interest, $4,692.79 at 5% interest, and $4,761.81 at 6% interest after 4 years of continuous compounding.

To solve this problem, we need to use the formula for continuous compound interest:
A = Pe^(rt)

Where A is the amount after t years, P is the initial principal, e is the mathematical constant approximately equal to 2.71828, r is the annual interest rate, and t is the time in years.

Using the given information, we can fill in the table as follows:

Interest Rate | Amount after 4 years
--------------|---------------------
2%            | $4,493.29
3%            | $4,558.56
4%            | $4,625.05
5%            | $4,692.79
6%            | $4,761.81

To find the amount after 4 years at each interest rate, we plug in the values of P, r, and t into the formula and simplify:

2%: A = $4000 * e^(0.02*4) = $4,493.29
3%: A = $4000 * e^(0.03*4) = $4,558.56
4%: A = $4000 * e^(0.04*4) = $4,625.05
5%: A = $4000 * e^(0.05*4) = $4,692.79
6%: A = $4000 * e^(0.06*4) = $4,761.81

Therefore, the investment grows to $4,493.29 at 2% interest, $4,558.56 at 3% interest, $4,625.05 at 4% interest, $4,692.79 at 5% interest, and $4,761.81 at 6% interest after 4 years of continuous compounding.

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Answer:

11.17, my answer needs to be 20+ characters soooooooo