The graph of the derivative f' of a function fis shown. y A y=f(x) 0. 4 9. (a) On what intervals is f increasing ? (Enter your answer using interval notation.) (b) On what intervals is f decreasing ? (Enter your answer using interval notation.) (c) At what value(s) of x does f have a local minimum ? (Enter your answers as a comma-separated list.) (d) On what interval(s) is f concave downward? (Enter your answer using interval notation.)

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