85/5
(50+35)/5
50/5 + 35/5
10+7=17
The difference quotient for the function f(x) is 
Given :
Difference quotient formula

Given function 
find the difference quotient using the formula
first we find out f(x+h) using given f(x)
replace x with x+h

Now replace it in our formula and also replace f(x)

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Answer:
8.2
Step-by-step explanation:
4(4)-7.8
The additive inverse of something is the number that, if you add it to the original number, you get 0.
The additive inverse of 5, for example, is -5. 5 plus -5 = 0.
You should be able to see how additive inverses are always going to be just the original number with the signs changed. (i.e., times -1)
The additive inverse of -4a would be 4a. -4a + 4a = 0.