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Consider the following function. (If an answer does not exist, enter DNE.) F( x ) = x+ 16 X (a) Find the intervals where the function f is increasing and where it is decreasing. (Enter your answer using interval notation.) increasing decreasing (b) Find the relative extrema of f. relative maximum ( x, y ) = relative minimum ( x, y ) = (c) Find the intervals where the graph of fis concave upward and where it is concave downward. (Enter your answer using interval notation.) concave upward concave downward (d) Find the inflection points, if any, of f