24. The accompanying gure shows the graph of the derivative of a function f. The domain of f is the closed interval [ 3, 3]. (a) For what values of x in the open interval ( 3, 3) does f have a relative maximum? Justify your answer. (b) For what values of x in the open interval ( 3, 3) does f have a relative minimum? Justify your answer. (0) For what values of x is the graph of f concave up? Justify your answer. ((1) Suppose f( 3) = 0. Sketch a possible graph off on the domain [ 3, 3]. y