2. (4 points) Which of the following graphs is a possible graph of the derivative of the function f graphed below. Write one letter in the answer box below. ANSWER: 3. (6 points) Daniel correctly determined the second derivative of the function j(x). Specifically, he determined that j" (x) = (2 + 1)2 ( 20 - 4 ) . On what interval(s) is j(x) concave up? (Show supporting work below or write sentences to briefly explain your reasoning. )