Suppose that the rate of change f' (x) of the average annual earnings of new car salespersons is shown in the figure.

(a) If a, b, and c represent certain years, what is happening to f (x), the average annual earnings
of the salespersons, at a, b, and c?
(b) Over what interval (involving a, b, or c) is there an increase in f (x), the average annual
earnings of the salespersons?

Transcribed Image Text:

f'(x) b.