The following table shows the velocity of a dog during the first 4 seconds of her run: t (sec) 0 1 2 3 4 v (ft/sec) 0 8 13 17 18 a) Give an estimate for the total distance traveled during her 4-second trip, using the right endpoint of each subinterval. b) Give an estimate for the total distance traveled during her 4-second trip, using the left endpoint of each subinterval