Use the graph of (x) to identify at which of the indicated points the derivati negative to positive. > 8 + 6 st (2, 4) (5,6) + -2 (-1,2) -2 + 2 a) (2,4), (5,6) b) (-1,2) 4 c) (-1,2), (2,4) d) (2,4) e) (-1,2), (5,6) + 6 8 x