The function f is differentiable on the closed interval [-6, 5] and satisfies f(-2) -7. The graph of f', the derivative of f, consists of a semicircle and three line segments, as shown in the figure above. (a) Find the values of f(-6),and f (5) b) On what intervals is fincreasing? Justify your answer c) Find the absolute minimum value of f on the closed interval [-6, 5]. Justify your answer d) For each of f"-5) and "3), find the value or explain why it does not exist.