a} Use a Riemann sum with 5 rectangles and lefthand endpoints to approximate the area between the :rraxis and f[a:) 2 111(1' | 2). where :13 E [l]. 15]. Round your answer to two decimal places. b) Is your answer in a) an overestimate or an underestimate for the actual area? Explain. {Your explanation should not involve integration or other calculation of the exact area.) Suppose that a vehicle's speed is given by the function y = Q t2 in hundreds of k'mfh'r, where t represents the time in hours. with t E [11 3]. a} Write down a Riemann sum using T1 rectangles. with right-hand endpoints, to approximate the distance {D} travelled by the vehicle over the two hour period. b) Use your answer in a] to calculate the exact distance travelled by the vehicle. Your answer should include appropriate units