We know that William
paid his deductible that amount is the $150.
Then William paid 20 percent of everything else. That's 20 percent of (750
minus 150), it is equal to 150.
Then the insurance company paid 80 percent of (750 minus 250), it is equal to
480.
700/12 equals 58 and 1/3.
Answer:
a. Let the variable be
for the fundraising activities and
as the revenue for foundation.
b. 
c. $43.2
d. $1416.67
Step-by-step explanation:
Given that:
The World Issues club donates 60% of the total of their fundraising activities.
Answer a.
Let us choose the variable
to represent the money earned during fundraising activities and
for the revenue generated for foundation.
Answer b.
Foundation will receive 60% of the total of the fundraising activities.
Equation to determine the money that will be received by foundation:

Answer c.
Given that x = $72, M = ?
Putting the value of x in the equation above:

Answer d.
Given that M = $850, x = ?
Putting the value of M in the equation above to find x:

So, the answers are:
a. Let the variable be
for the fundraising activities and
as the revenue for foundation.
b. 
c. $43.2
d. $1416.67
If you want to take a square root of a square root you will need 2 squares roots,
For example, i want the square root of the square root of 16.
I'll take it first: √16 = 4 and again, √4 = 2
So, the square root of the square root of 16 is 2.
But you can also make a root with index 4.
Because if you do 2.2.2.2 you will take 16.