Look at the graph. to find the rate of change of the function, kevin did the following: what was kevin’s mistake? a)he incorrectly chose (–1, 2.5) as a point on the graph. b)he incorrectly chose (0, 2) as a point on the graph. c)he mixed up the numerator and the denominator of the fraction. d)he subtracted –1 from 0 when he should have added –1 to 0.