f(x) = 13 - 4.5x2 - 12x - 1 a) Find the first and second derivatives. f'(x) = f" (2) = b) Identify the graph that displays f in blue and f" in red. ? A. B. C. D. c) Using the graphs of f and f", indicate where f is concave up and concave down. Give your answer in the form of 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