s) Consider the function f(x) = x2/5(x - 5). This function has two critical numbers AB Then A = For each of the following intervals, tell whether f(x) is increasing or decreasing. (-, A]: ? [A, B]: ? [B,00) ? and B The critical number A is ? Then C = and the critical number B is ? There are two numbers C < D where either f"(x) = 0 or f" (x) is undefined. and D = Finally for each of the following intervals, tell whether f(x) is concave up or concave down. (-, C): ? (C, D) ? (D, 0) ?