Problem 6. The graph of f' (not f) is given below. At which of the marked values of x is A. f(x) greatest? x = B. f(x) least? x = c.f'(x) greatest? x = D. f'(x) least? x = E.f"(x) greatest? x = F.f"(x) least? x = x1 x2 x3 x4 x5 x6 (Note that this is a graph of f', not a graph of f.)

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