In each case below, select the best answer to the question. (a) The graph of f(x) is shown below. What is the sign of the second derivative of f(x)? ---Select--- ✓ -10 tin 10 5 x S(x) 0 S -10 tin 10 (b) The formula for g is given by g(x) = -ax² + bx + 639 for some positive constants a and What is the sign of the second derivative of g(x)? ---Select--- (c) Some values of a function S are shown in the table below. What is the sign of the second derivative of S(x)? ---Select--- v 1 2 3 4 59 60 62 65

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