15. Determine where the given function is concave up and where it is concave down. Show all work. Do not graph the function. 1 G(x)= 2x4 x3 +10 16. Find the absolute maximum and minimum values of each function over the indicated interval, and indicate the x-values at which they occur. Show all work. f(x) = x4 2x3. [ 5.5] 17. Find the absolute maximum and absolute minimum values of the function. if they exist, on the indicated interval. Show all work. 2 r(x)=2-x3;[-64, 64] 13. Draw a graph to match the description given. f(x) has a negative derivative over ( - oo. - 1) and (3,00) and a positive derivative over ( 1,3), and f'( - 1) = 0, but f'(3) does not exist. Which of the following graphs matches the description? OA