Explanation
We are told to find the midpoint of the line segment. To do so, we will use the formula:

In our case

Substituting the values above

Thus, the midpoint is (6,1)
Set up a system of equations:
sum of 3 #s is 125:
x + y + z = 125
first # is 5 more than third:
x = z + 5
second # is 3 times the third:
y = 3z
then use that info to solve for the numbers
Step-by-step explanation:
Cost of CDs
= Number of CDs * Cost of one CD
= d * $12
= $12d. (D)
The answer is using multiplication as we have a unit rate and we wish to find the total.
Hello!

To find the amount of cookies sold, we will need to divide the cost of each cookie from the total raised. Therefore:
Let c = cookies sold
60 = 0.75c
Divide both sides by 0.75:
60 / 0.75 = c
c = 80 cookies.