Approximate _2(x + 3) da via the Riemann sum. Use the partition of five subintervals (of equal length), with the sample point ; being the right end point of the i-th interval. Approximate J_, (2x2 - 8) da via the Riemann sum. Use the partition of four subintervals (of equal length), with the sample point ; being the middle point of the i-th interval. An object at the origin at time t = 0 has velocity, measured in meters per second, 30 if 0