(A) Estimate the area under the graph of f(x) = 3x3+5 from * = -1 to x = 3, first using 4 approximationg rectangles and right endpoints, and then improving your estimate using 8 approximation rectangles and right endpoints. 4 Rectangles = 8 Rectangles = (B) Repeat part (A) using left endpoints. 4 Rectangles = 8 Rectangles = (C) Repeat part (A) using midpoints. 4 Rectangles = 8 Rectangles =