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Mathematics 4 Online
OpenStudy (anonymous):

After an accident, police can estimate the speed that a car was traveling by measuring its skid marks. The formula r=2√5L can be used, where r is the speed, in miles per hour, and L is the length of the skid marks, in feet. Estimate the speed of a car that left skid marks (a) 50 ft long; (b) 180 ft long. How fast was the car traveling if it left skid marks 50 ft long? (Simplify your answer. Type an integer or a decimal. Round to the nearest tenth.) How fast was the car traveling if it left skid marks 180 ft long? (Simplify your answer.Type an integer or a decimal. Round to the nearest tenth)

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