PLEASE SOLVE A, B, C, D

Use nite approximations to estimate the area under the graph of the function x] = 4 x2 between it = 2 and x: 2 tor each of the following cases. a. Using a lower sum with two rectangles of equal width b. Using a lower sum with four rectangles of equal width 0. Using an upper sum with two rectangles of equal width d. Using an upper sum with four rectangles of equal width E> a. The area under the graph of fix] using a lower sum with two rectangles ot equal width is E. [Type an integer or a decimal.)