(-6,2) (3,2) Graph of f' 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. 1). Use the above graph of f' to answer the following questions a). On what intervals is f increasing and concave down. Justify your answers b). Find all values of x on the interval -6