Answer
As illustrated in picture
Work Step by Step
In [0,4], f'(x) = 2/4 = 0.5
In [4, 6], f'(x) = 0 (y does not change)
In [6, 10], f'(x) = (10-2)/(10-6) = 2
Note that this question does not require ANY calculus because this is the slope of a linear function
