7. The following is the graph of the derivative function f(x) of a differentiable function f defined on the interval (0, 11) 10 8 9 10 11 -10 -15 Note that the following questions are about the function/ mot the function r a. On what intervals is fincreasing? Decreasing? b. At what values ofx does fhave a local maximum? A local minimum? c. On what intervals is f concave up? Concave down? d. At what values of x does fhave a point of inflection? e. Assuming that f(O)-0, sketch a graph ofj