The graph of g'(x) is given above. g'(x) has a tangent of slope = 0 at x = -7, x = 2 and x = 5 and a tangent of an undefined slope at x = 4. In each of the following, you should justify your answer by showing all working. Over the interval (-9,9), a) Find the values of x for which g(x) has a relative minimum. b) Find all the values of x at which g attains a relative maximum. c) Find all values of x at which g"(x)