Suppose that f(x)=9x2x33. (A) Find all critical numbers of f. If there are no critical numbers, enter 'NONE'. Critical numbers = (B) Use interval notation to indicate where f(x) is increasing. Note: Use 'INF' for , '-INF' for , and use 'U' for the union symbol. Increasing: (C) Use interval notation to indicate where f(x) is decreasing. Decreasing: (D) List the x-coordinates of all local maxima of f. If there are no local maxima, enter 'NONE'. x values of local maxima = (E) List the x-coordinates of all local minima of f. If there are no local minima, enter 'NONE'. x values of local minima = (F) Use interval notation to indicate where f(x) is concave up. Concave up: (G) Use interval notation to indicate where f(x) is concave down. Concave down: (H)List the x values of all inflection points of f. If there are no inflection points, enter 'NONE'. x values of inflection points = (I) Use all of the preceding information to sketch a graph of f. When you're finished, enter a "1" in the box below. Graph Complete