The function f(x) = 47.52x + 121.45 represents the total amount, f(x), in dollars, André earns for x hours of work. Which statement describes the rate of change?
A.His base pay is $47.52.
B.His base pay is $121.45.
C.He earns $47.52 per hour.
D.He earns $121.45 per hour.
