Derek sent a chain letter to his friends, asking them to forward the letter to more friends. The group of people who receive the email gains 9/10 of its size every week and can be modeled by a function, P, which depends on the amount of time, t (in weeks).
Derek initially sent the chain letter to 40 friends.

Write a function that models the group of people who receive the email t weeks since Derek initially sent the chain letter

Answer:

b

Step-by-step explanation:

use slope intercept form

Answer:

2

Step-by-step explanation:

Since you need it fast, I am not going to explain.

(2, 4) - (6, 12) = (-4, -8)

-8/-4 = 2

Answer:

A-168

B-81

C-117

Step-by-step explanation:

you multiply all of the numbers together.

Answer:

Yes

Can I get brainliest

Answer:

Yes, I believe so.

Step-by-step explanation:

Answer:

8, 9

Step-by-step explanation:

Since x > 7

This means that x cannot equal 7 but must be greater values than 7.

Thus 8 and 9 are solutions

Step-by-step explanation:

Given : If the hypotenuse of a 30-60-90 triangle has length 15 then the shorter leg has length  5.5 , 6.5 , 7.5.

To find : What is the length of the other leg and hypotenuse ?

Solution :

For a  30-60-90 triangle, sides are in the ratio  [tex]1:\sqrt{3}:2[/tex]

where, 1 is the shorter side,  

[tex]\sqrt{3}[/tex] the other side

and 2 the hypotenuse.

Short leg = 5.5

Other leg = [tex]5.5\times \sqrt3=5.5\sqrt3[/tex]

Hypotenuse = [tex]5.5\times 2=11[/tex]

Short leg = 6.5

Other leg = [tex]6.5\times \sqrt3=6.5\sqrt3[/tex]

Hypotenuse = [tex]6.5\times 2=13[/tex]

Short leg = 7.5

Other leg = [tex]7.5\times \sqrt3=7.5\sqrt3[/tex]

Hypotenuse = [tex]7.5\times 2=15[/tex]

Final answer:

In a 30-60-90 triangle with a hypotenuse of 15, the shorter leg has a length of 7.5, based on the ratio 1:√3:2.

Explanation:

If the hypotenuse of a 30-60-90 triangle has length 15, then to find the length of the shorter leg, we can use the properties of this special right triangle. In a 30-60-90 triangle, the ratio of the lengths of the sides is 1:√3:2. In other words, if the shorter leg is 'x', the longer leg is 'x√3', and the hypotenuse is '2x'.

Since the hypotenuse is 15, we set '2x' equal to 15 and solve for 'x':

2x = 15

x = 15 / 2

x = 7.5

The shorter leg of the triangle has a length of 7.5.

Answer:

Quadrant 2

Step-by-step explanation:

Here's how you distinguish which points are in which quadrants.

Quadrant 1: (+x, +y)

Quadrant 2: (-x, +y)

Quadrant 3: (-x, -y)

Quadrant 4: (+x, -y)

(-3,6) has a negative x and a positive y. All the points in Quadrant 2 have a negative x and positive y.

Answer:

The stereo is now being sold for $227.80.

Step-by-step explanation:

To calculate percentage discounts, multiply the original price (268) by the discount percentage (.85). Make sure to put move the percentage value two places to the right before multiplying, as percentages are percentages of a whole.

268 * .85 = 227.8

Answer:

625 miles

Step-by-step explanation:

This is because, since each 25 miles takes one gallon 25 gallons would mean you would go 25 times 25 miles which is 625 miles in all.

Answer:

it is repeating decimal.

Answer: repeating

Step-by-step explanation:

Answer:

The answer is x-5 or "B" on edge

Answer:

3/10

Step-by-step explanation:

Answer:

Step-by-step explanation:

First, convert 3/5 into 10ths.

3/5 = 6/10

Now, we know what 3/5 is equal to, we subtract.

9/10 - 6/10 = x

When we subtract, we get 3/10.

So that means, x =3/10

Hope this helps, have a great day, and stay safe.

Answer:

135 grams

Step-by-step explanation:

Since there are 15 grams of powder in a 22oz serving, if you divide 198 by 22 you will get 9 total servings. If you multiply 15 by 9 you will get 135 total grams.

Answer:

3

Step-by-step explanation:

The average rate of change of g(x) in the closed interval [ a, b ] is

[tex]\frac{g(b)-g(a)}{b-a}[/tex]

Here [ a, b ] = [ - 3, 2 ], thus

g(b) = g(2) = - 2² + 2(2) + 8 = - 4 + 4 + 8 = 8

g(a) = g(- 3) = - (- 3)² + 2(- 3) + 8 = - 9 - 6 + 8 = - 7

average rate of change = [tex]\frac{8-(-7)}{2-(-3)}[/tex] = [tex]\frac{15}{5}[/tex] = 3

Answer:

5

Step-by-step explanation:

30 years => 20

60 years => 10

90 years => 5

We will be left with 5 g of Cesium-137 after 90 years, given its half-life of 30 years and the initial quantity we have as 40 g.

Many elements tend to decompose over some time. The period over which an element reduces to half of itself in quantity is called the half-life of that substance.

The formula for the quantity of the element at a certain time t can be given as:

[tex]N_{t} = N_{0}\left ( \frac{1}{2} \right )^{\frac{t}{t_{1/2}}}[/tex]

Where,

[tex]N_{t}[/tex] is the quantity of the element at time t,

[tex]N_{0}[/tex] is the initial quantity of the element,

[tex]{t_{1/2}[/tex] is the half-life of the element.

In the question, we are given that an element, Cesium-137 has a half-life of approximately 30 years.

We are asked to find the quantity of this element left after 90 years when we had an initial sample of 40 g.

To solve for the quantity left, we can use the formula for the quantity of the element at a certain time t can be given as:

[tex]N_{t} = N_{0}\left ( \frac{1}{2} \right )^{\frac{t}{t_{1/2}}}[/tex]

Where,

[tex]N_{t}[/tex] is the quantity of the element at time t,

[tex]N_{0}[/tex] is the initial quantity of the element,

[tex]{t_{1/2}[/tex] is the half-life of the element,

by taking t = 90 years, [tex]N_{0}[/tex] = 40 g, [tex]{t_{1/2}[/tex] = 30 years, and [tex]N_{t}[/tex] = ?.

∴ [tex]N_{t} = N_{0}\left ( \frac{1}{2} \right )^{\frac{t}{t_{1/2}}}[/tex]

or, [tex]N_{t} = 40\left ( \frac{1}{2} \right )^{\frac{90}{30}}} g[/tex]

or, [tex]N_{t} = 40\left ( \frac{1}{2} \right )^{3}} g[/tex]

or, [tex]N_{t} = 40\left ( \frac{1}{8} \right ) g[/tex]

or, [tex]N_{t} = 5 g[/tex] .

∴ We will be left with 5 g of Cesium-137 after 90 years, given its half-life of 30 years and the initial quantity we have as 40 g.

Learn more about the half-life of a substance at

https://brainly.com/question/2320811

#SPJ2

Answer:

adding salt makes the water freeze slower and evaporate slower too.

Step-by-step explanation:

While pure water freezes at 0°C (32°F), salt water needs to be colder before it freezes and so it usually takes longer to freeze. The more salt in the water, the lower the freezing point.

Step-by-step explanation:

BC is tangent to the circle with center A at point C and AC is radius.

[tex] \therefore AC \perp BC\\

\therefore \angle ACB =90°\\[/tex]

Now by Pythagorean theorem:

[tex] AB^2 = AC^2 + BC^2 \\

\therefore AC^2 = AB^2-BC^2\\

\therefore x^2 = 17^2-14^2\\

\therefore x^2 =289-196\\

\therefore x^2 =93\\

\therefore x =\sqrt{93}\\

\therefore x =9.64365076\\

\huge \purple {\boxed {\therefore x = 9.64\: units}} [/tex]

message me! i have made an edited file of it finished <3

How much do you owe?

Since each roommate will pay 20% of the $6,000 bill, you will owe 1 * 0.2 * 6000 = $1200.

What is 10% of the total repair bill?

10% of the total repair bill is 0.1 * 6000 = $600.

What will each roommate's 20% share be?

Each roommate's 20% share will be 0.2 * 6000 = $1200.

I hope this helps! Let me know if you have any other questions.

Answer:

- the angles in the smaller prism measure 90 degrees

- the perimeter of the rectangular bases changes by a factor of 2

-the area of the rectangular bases changes by a factor of 4

Step-by-step explanation:

I just got it right

Answer:

the angles in the smaller prism measure 90 degrees

the perimeter of the rectangular bases changes by a factor of 2

the area of the rectangular bases changes by a factor of 4

Step-by-step explanation:

Answer:

8 in

Step-by-step explanation:

The ratio of sides and perimeter in similar figures are equal.

let x be the perimeter of the smaller figure, then by proportion

[tex]\frac{7}{28}[/tex] = [tex]\frac{2}{x}[/tex] ( cross- multiply )

7x = 56 ( divide both sides by 7 )

x = 8

The perimeter of the smaller pentagon is 8 in

Answer:

3.75

Step-by-step explanation:

3.75 you couldve used calculator :/

Answer:

3.75.

Step-by-step explanation:

15/4 = 3 with a remainder of 3. (3 3/4)

Then you make that into a decimal...

--> 3/4 is equal to 75 percent.

So 3.75..

Answer:

8 possibilities

Step-by-step explanation:

The pies we have to choose from are 1)Apple 2)Cherry 3)Blueberry or 4)Peach.

The beverages we have to choose from are 1)Milk and 2)Juice.

Here are the possibilities:

Apple + Juice

Apple + Milk

Cherry + Juice

Cherry + Milk

Blueberry + Juice

Blueberry + Milk

Peach + Juice

Peach + Milk

So we have a total of 8 possibilities for one pie and one beverage.

Answer:

8 outcomes

Step-by-step explanation:

Answer:

A =180 in^2

Step-by-step explanation:

The area of a triangle is given by

A = 1/2 bh

The base is 12 and the height is 30

A = 1/2 *12*30

A = 1/2 *360

A =180 in^2

To find the surface area of a 10-quarter stack, calculate the surface area of each quarter and then multiply by the number of quarters.

To find the surface area of a 10-quarter stack, we need to calculate the surface area of each quarter and then multiply it by the number of quarters in the stack. The surface area of a quarter can be calculated using the formula for the surface area of a cylinder: SA = 2πr^2 + 2πrh.

Since the diameter of a quarter is 2.2 cm, the radius (r) is half of that, which is 1.1 cm. The approximate height (h) of a quarter is 0.17 cm.

Substituting these values into the formula, we get: SA = 2π(1.1 cm)^2 + 2π(1.1 cm)(0.17 cm). Calculating this gives us the surface area of a single quarter. Then, multiplying it by 10 gives us the surface area of a 10-quarter stack.

Answer:

1) [tex]\frac{8\pi }{3}[/tex] or 8.38

2) [tex]\frac{9\pi }{8}[/tex] or 3.53

3) 4[tex]\pi[/tex] or 12.57

Step-by-step explanation:

The formula for arc length is [tex]2\pi r(\frac{angle}{360})[/tex]

1) 2[tex]\pi[/tex](4)× [tex]\frac{120}{360}[/tex]

2)[tex]2\pi (1.5)[/tex]×[tex]\frac{135}{360}[/tex]

3) [tex]2\pi(3)[/tex]×[tex]\frac{240}{360}[/tex]

Answer:

  (x, y) = (1/2, -2)

Step-by-step explanation:

Many people find it convenient to work these problems by eliminating fractions as a first step.

Here, you can do that by multiplying the first equation by 4

  4(1/2x +2y) = 4(-15/4)

  2x +8y = -15

From here, there are a number of possibilities for arriving at a solution.

__

Multiply the first equation by 2 and you have ...

  4x +16y = -30

The second equation says you can replace the first term with -y:

  -y +16y = -30

  15y = -30

  y = -30/15 = -2

Substituting this value into the second equation gives ...

  4x = -(-2) = 2

  x = 2/4 = 1/2

The solution is (x, y) = (1/2, -2).

__

Alternate solution

You can rearrange the second equation to give an expression for y:

  y = -4x

Then, substitute this into the first equation:

  (1/2)x +2(-4x) = -15/4

  (-15/2)x = -15/4

  x = (-15/4)/(-15/2) = 2/4 . . . . . . divide by the coefficient of x

  x = 1/2

  4(1/2) = -y = 2 . . . . . substitute for x in the second equation

  y = -2 . . . . . . . . . . . . multiply by -1

_____

Additional comments on problem solving

I find the key to working troubling problems is to be very meticulous. Make certain you follow the rules of algebra: anything you do to one side of the equation must also be done to the other side. I find it easier to think in those terms when moving stuff around.

Some folks would say, "move this term over there and ...". I like to think of it as "subtract this term from both sides of the equation."

It also helps to be careful when dealing with fractions. Make sure you know how to add, subtract, multiply, and divide fractions. You should be just as able to handle that arithmetic as with integers or decimals. Use a calculator if your skills are shaky.

As you may notice, a graphing calculator can help you verify your answer.

Answer:

4 days

Step-by-step explanation:

268-112= 156    

156 divided by 39 = 4

Answer:

i think it is 4

Step-by-step explanation:

bc you do 268-112=156 then you take 156 and divide it by 39 and you end up getting 4.

Answer:

x > (c - a)/b

Step-by-step explanation:

a > -bx + c

We need to make x the subject of the inequality so, first remove c from the right hand side of the inequality by adding -c to both sides. So,

a - c > -bx

Now, we need to remove -b from the right hand side. So, we will divide both sides of the inequality with -b. Multiplying the inequality with a negative number will also change the sign of the inequality. So,

-(a-c)/b < x

x > (c - a)/b

Answer:

C on edge

Step-by-step explanation:

Answer:

Part A

Months, Pounds

3,5

4,9

5,13

6,17

7,21

8,25

9,29

Part B

1 year = 12 months

If we continue the chart it would look like this:

10,33

11,37

12,41

Lucky will weigh 41 pounds by 1 year.

Hope this helps!

Final answer:

Lucky will weigh 41 pounds by the time he is one year old.

Explanation:

To complete the table representing Lucky’s current weight as a function of his age, we'll calculate Lucky's expected weight at each month by using the growth rate of four pounds per month. Starting with Lucky's current weight at three months old, which is five pounds:

Age 4 months: 5 pounds + (1 month * 4 pounds/month) = 9 pounds

Age 5 months: 5 pounds + (2 months * 4 pounds/month) = 13 pounds

Age 6 months: 5 pounds + (3 months * 4 pounds/month) = 17 pounds

Age 7 months: 5 pounds + (4 months * 4 pounds/month) = 21 pounds

Age 8 months: 5 pounds + (5 months * 4 pounds/month) = 25 pounds

Age 9 months: 5 pounds + (6 months * 4 pounds/month) = 29 pounds

Continuing with the growth rate of four pounds per month, by the time Lucky is one year old, which is 12 months, the calculation would be:

Lucky's weight at one year old = initial weight + (growth over months)

12 months old: 5 pounds + (9 months * 4 pounds/month) = 41 pounds.