| I l 8. The graph of the rst derivative f ' of a function f is shown. (a) On what intervals is f increasing? Explain. (b) At what values of x does f have a local maximum or minimum? Explain. (c) On what intervals is f concave upward or concave downward? Explain. (d) What are the xcoordinates of the inection points of f '? Why? 1. Due to electronic rights. some third party content may.[ be suppressed from the eBook andfor eChapterts)