To find the rate of change of the function, Kevin did the following: x
0-(-1)
2-2.5
1
-0.5
= -2
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 O when he should have added -1 to 0.