Please i need the critical numbers, the concavity and the inflection points

f(x) = 3x6 - 525. (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 ( ) is increasing. Note: Use 'INF' for co, '-INF' for -co, and use 'U' for the union symbol. Increasing: 25 189% (C) Use interval notation to indicate where f ( ) is decreasing. Decreasing: - go , 25 (D) Find the a-coordinates of all local maxima of f. If there are no local maxima, enter 'NONE'. values of local maxima = none (E) Find the a-coordinates of all local minima of f. Note: If there are no local minima, enter 'NONE'. values of local minima = 25 18 (F) Use interval notation to indicate where f(x) is concave up. Concave up: 10 19: 00 (G) Use interval notation to indicate where f(x) is concave down. Concave down: (H) List the a values of all inflection points of f. If there are no inflection points. enter 'NONE