we are supposed to explain
Which situation could be solved using the equation 
As we can see in the given equation , one number is -4 and the other number is 4
When we add two number of same value but opposite in sign we get zero.
This equivalent to the real life situation of paying a post paid bills.
Suppose you are using a post paid service , and the bills gets generated at the end of the month.
Suppose the bills amount is $x.
Once you pay that bills , then total outstanding again becomes $0.
Because 
There were 225 jars of creamy peanut butter.
I don't know what part D is asking but the answer to part c is 32(4)x8=258
Substitute in x to get:
4^2 = 16
16 - 5 = 9