A car is driving away from a crosswalk The formula d t 2t expresses the car s distance from the crosswalk in feet d in terms of number of seconds t since the car started moving a Suppose t varies from t 2 tot 5 i Does the car travel at a constant speed over this interval of time No ii What is the car s average speed over this interval of time feet per second Preview b Suppose t varies from t 1 7 to t 2 5 i Does the car travel at a constant speed over this interval of time No ii What is the car s average speed over this interval of time feet per second Preview