Police can use the length of a skid mark on pavement to determine the speed of the vehicle before the brakes were applied in an attempt to stop. A formula has been determined that shows the relationship among the speed of the car in kilometers per hour (s), the coefficient of friction of the road (f), and the length of the skid marks i meters (d)

s =√(252df)

At the scene of an accident, a dry stretch of the pavement has a coefficient of friction of 0.75. The skid mark is made by the vehicle was 29m. How fast was the car traveling? Express your answer as an exact value and as a decimal, round to the nearest whole value. Explain the benefit of both forms of the answer.