(2 points) Consider the function f(@) = x /(x -10). This function has two critical numbers A

(2 points) Consider the function f(x) x4/5(x 10). This function has two critical numbers A < B Then A and B For each of the following intervals, tell whether f(x) is increasing or decreasing. B,oo) ? The critical number A is Q v and the critical number B is There are two numbers C < D where either f" (x) = 0 or f" (x) is undefined. Then C and D Finally for each of the following intervals, tell whether f(x) is concave up or concave down. (00, C): ? (D, 00)) ?