Use the given graph of f over the interval (0, 6) to find the following. VA (a) The open intervals on which f is increasing. (Enter your answer using interval notation.) (b) The open intervals on which fis decreasing. (Enter your answer using interval notation. ) (c) The open intervals on which fis concave upward. (Enter your answer using interval notation.) (d) The open intervals on which fis concave downward. (Enter your answer using interval notation.) (e) The coordinates of the point of inflection. ( x, y) = (