Use the graph of y = f (x) in Problem 1 to identify at which of the

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Use the graph of y = f (x) in Problem 1 to identify at which of the indicated points the derivative f'(x)

y 6+(1,5) (-1,2) (4, 1) + 4 -2 6 -2+ 2.

(a) Changes from positive to negative

(b) Changes from negative to positive

(c) Does not change sign.

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