Use iinite approximations to estimate the area under the graph of the function fix} = 15 x2 2x between X: 5 and x: 3 for each of The following cases. a. Using a lower sum with two rectangles of equal width b. Using a lower sum wimdangies of equal width c. Using an upper sum with two rectangles of equal width d. Using an upper sum with four rectangles of equal width a.The area under The graph of fix) using a lower sum with two rectangles of equal width is El {Type an integer era decimal.) b. The area under the graph of x} using a lower sum with tour rectangles of equal width is E (Type an integer or a decimal} c. The area under ihe graph of x} using an upper sum with two rectangles of equal width is E. {Type an integer or a decimal.) d. The area under the graph of x} using an upper sum with four rectangles of equal width is :|. {Type an integer or a decimal.)