The police department uses a formula to determine the speed at which a car was going when the driver applied the
brakes, by measuring the distance of the skid marks. The
equation d = 0.0015r^2 + r models the distance, d, in feet
traveled after applying the brakes in a car moving
r miles per hour (r is the speed of the car).
If the distance the car traveled after applying the brakes
equals 88 feet, what, what was the speed of the car? *
*Round your answer to the nearest hundredth miles per hour.

mph