For a function f(x), the difference quotient is x+1/2h+15. Which statement explains how to determine the average rate of change of f(x) from x=5 to x=8 a) Substitute 5 for x and 3 for h in the expression x+1/2h+15
b) Substitute 5 for x and 8 for h in the expression x+1/2h+15
c) Substitute 8 for c and 5 for h in the expression x+1/2h +15
d) Substitute 8 for x and 3 for h in the expression x+1/2h +15