13. Sketch a graph of f where: f' (x) 0 for all x 14. Find the absolute maximum and minimum values of the function on the indicated interval. (4 pts) f( x ) = - 3x x2 +1 [0, 3] 15. Use differentiation to find the intervals where the function is increasing and decreasing. f(x) =2x* -4x2 +1 increasing: decreasing