A children's wind-up car toy travels a distance, d inch- es, as modeled by the function d = 12 +8t where t is
the number of seconds after the car has been wound
up and released. If the car is released at 12 feet, to
the nearest second, how many seconds would it take to
reach 21 feet?
O 10
O 11
O 12
O 13
O 14