Use the graph of the derivative f' of a continuous function f is shown. (Assume f' continues to co.) y 4 y = f'(x) 2 X 2 4 18 -2 (a) On what interval(s) is f increasing? (Enter your answer using interval notation.) [1,6]U[8,00) On what interval(s) is f decreasing? (Enter your answer using interval notation.) [0,1] U [6,8] (b) At what value(s) of x does f have a local maximum? (Enter your answers as a comma-separated list.) x = 6 At what value(s) of x does f have a local minimum? (Enter your answers as a comma-separated list.) x = 1,8 (c) On what interval(s) is f concave upward? (Enter your answer using interval notation.) (0,2) U (3,5) U(7,00) On what interval(s) is f concave downward? (Enter your answer using interval notation.) (2,3) U (5,7)

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