The total cost after tax to repair keisha's iphone is represented by the expression. 0.09(75h)+75h where h represents the number of hours it takes to repair keisha's iphone what part of the expression represents the amount of tax keisha must pay?or explain how i figure this out

The equation represents the function f, and the graph represents the function g. f(x)=3(5/2)^x determine the relationship between the growth factors of f and g. a. the growth factor of g is twice the growth factor of f. b. the growth factor of f is twice the growth factor of g. c. the growth factor of f is 2.5 times the growth factor of g. d. the growth factor of f is the same as the growth factor of g.