Consider the equation below. (If an answer does not exist, enter DNE.) f(x) = 44 - 50x2 + 9 (a) Find the interval on which fis increasing. (Enter your answer using interval notation.) Find the interval on which fis decreasing. (Enter your answer using interval notation.) x (b) Find the local minimum and maximum values of f. local minimum value local maximum value 9 (c) Find the inflection points. (x, y) =( (x, y) = =( (smaller x-value) (larger x-value) Find the interval on which fis concave up. (Enter your answer using interval notation.) Find the interval on which f is concave down. (Enter your answer using interval notation.)