y. Problem 12 (1 point) f() = 2 + 1 a) Find the first and second derivatives. f'(x) = f" (z) = b) Identify the graph that displays f in blue and f" in red. c C. c) Using the graphs of f and f", indicate where f is concave up and concave down. Give your answer in t an interval. NOTE: When using interval notation in WeBWork, remember that: You use 'INF' for co and '-INF' for -co. And use 'U' for the union symbol. Enter DNE if an answer does not exist. f is concave up on f is concave down on