Question 14 please

12. Repeat Exercise 10, choosing the representative points to be the right endpoints of the subintervals. In Exercises 13, 14, 15 and 16, find an approximation of the area of the region R under the graph of the function f on the [a, b]. In each case, use n subintervals and choose the representative points as indicated. 13. f(x) = x2 + 1; [0, 2]; n = 5; midpoints Answer + 14. f(x) = 4 - x2; [-1, 2]; n =6; left endpoints