a) Approximate the area under graph (a) ct ttx) = 21x2 over the interval [2.10] by computing the area of each rectangle to four decimal places and then adding. b) Approximate the area under graph (b) of {(x) = 2.' x2 over the interval [2.10] by computing the area of each rectangle to four decimal places and then adding, unn- The area under graph (3) is approximately U. (Round to four decimal places as needed.) The area under graph ([7) is approximately [1. (Round to four decimal places as needed)