The formula d = 0.5 t 2 + 4 models a toy car's distance from a fire hydrant (in feet) t seconds after it began moving. a. Three seconds after it began moving, the toy car was feet away from the fire hydrant. Eleven seconds after it began moving, the toy car was feet from the fire hydrant. b. For the interval described in part (a), the toy car moved feet over a period of time of seconds. c. During the interval described in part (a), the toy car Select an answer move at a constant speed. d. If we pretend that the car was moving at a constant speed during this interval, the constant speed necessary to cover the same distance in the same amount of time is feet per second