What is the division of 7(5642 explain?

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.