By the definition for the absolute value,


So for the compound function

, there are three intervals to consider. What happens when

? when

? when

?
You have
We will be using the Point Slope formula which is 
The information we are given is that m = -4 and the point is (2,-5), so we can input it into the equation.

This simplifies into 
Then we can subtract 5 from each side to get the answer:

If he paid $57 monthly for 14 months, the total amount paid is:

He paid $798 in total
Since the diameter of the cylinder is 10, its radius is half that, or 5, thus