The formula d f 2 is used to find how fast a car was traveling before an accident where s is speed (in mph), d is the length (in feet) of the skid mark left by the car, and f is the coefficient of friction (which is an indicator of road condition). Sophie, a police officer, must decide if the driver in a car accident was speeding in a 35 mph speed zone. The car's skid mark length is 76 feet. The coefficient of friction is 0.80. Write the equation Sophie needs to use, substituting in the values of d and f, to determine the speed of the car before the accident. Solve the equation in part 1. Round your answer to the nearest tenth. Was the driver speeding? Why or why not? If the skid mark had been 4 times longer, how many times as fast would the driver have been going as compared to the speed found in part 2? Show your work and/or explain your answer.