Graph of f' The function f is differentiable on the closed interval [ 6, 5] and satises f (HZ) = 7. The graph of f ', the derivative off, consists of a semicircle and three line segments, as shown in the gure above. On what intervals is f increasing? Justify your answer. Find the absolute minimum value of f on the closed interval [6, 5]. Justify your answer. For each of f \"( 5) and f \"(3), nd the value or explain why it does not exist