The distance, s (in feet) , traveled by a car moving in a straight line is given by the formula $ t2 + 2t + 1 where t is the number of seconds elapsed since the car started moving: a. Determine the average speed for the time period from t 1 to t = 9 feet per second b. Determine the average speed for the time period from t 1 to t 6.9 feet per second Preview Determine the average speed for the time period from t 1 to t 6.3 feet per second