The function 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 (-6,2) Graph of f (3,2)