Find the interval(s) on which f is increasing. (Enter your answer using interval notation.) Incorrect: Your answer is incorrect. (b) Find the interval(s) on which f is decreasing. (Enter your answer using interval notation.) (c) Find the interval(s) on which f is concave upward. (Enter your answer using interval notation.) (d) Find the interval(s) on which f is concave downward. (Enter your answer using interval notation.) (e) Find the coordinates of the inflection point(s). (Order your answers from smallest to largest x, then from smallest to largest y.) (x, y)