Answer:
--- small circle
--- big circle
Step-by-step explanation:
Given
-- sum of areas

Required
The radius of the larger circle
Area is calculated as;

For the smaller circle, we have:

For the big, we have

The sum of both is:


Substitute: 


Substitute 

Factorize
![80\pi = \pi[ r^2 + 4r^2]](https://tex.z-dn.net/?f=80%5Cpi%20%3D%20%5Cpi%5B%20r%5E2%20%2B%204r%5E2%5D)
![80\pi = \pi[ 5r^2]](https://tex.z-dn.net/?f=80%5Cpi%20%3D%20%5Cpi%5B%205r%5E2%5D)
Divide both sides by 

Divide both sides by 5

Take square roots of both sides


The radius of the larger circle is:



Answer:
(2,0)
Step-by-step explanation:
To find the x intercept, set y =0 and solve for x
5x-y =10
5x -0 = 10
5x=10
Divide by 5
5x/5=10/5
x=2
(2,0)
Answer:
c)$24,000
Step-by-step explanation:
The function that models the decline of the sales is

where x is the number of weeks after the end of the campaign.
At the end of the campaign, will be no more weeks left.
So we x=0, and solve for y,

The correct answer is c)$24,000
Perform the indicated multiplication first: -15 + 5q + 4 = 5q - 11
Note that 5q appears on both sides of this equation. Cancelling, we get :
-11 = -11. This is always true. Thus, -5(3-q) +4=5q-11 is true for all q.