The graph of the derivative f ? ' of a function f is shown. (a) On what interval is f increasing? (Enter your answerusing interval notation.) On what intervals is f decreasing? (Enter your answer...

The graph of the derivative f?' of a function f is shown. On what interval is f increasing? (Enter your answer using interval notation.) On what intervals is f decreasing? (Enter your answer using interval notation.) At what values of x does f have a local maximum or minimum? (Enter your answers as a comma-separated list.)