If f (x) := x2 for x (0, 4), calculate the following Riemann sums, where has the

Question:

If f (x) := x2 for x ˆˆ (0, 4), calculate the following Riemann sums, where has the same partition points as in Exercise 1, and the tags are selected as indicated.
(a) with the tags at the left endpoints of the subintervals.
(b) with the tags at the right endpoints of the subintervals.
(c) with the tags at the left endpoints of the subintervals.
(d) with the tags at the right endpoints of the subintervals.