The speed that a car is going on a dry road when the driver puts on the breaks can be estimated by the equation s=√24d , where d is the distance that the car skids in feet. A car that was in an accident skidded 214 ft. Find the speed, in miles per hour, that a car was going before the accident occurred. Round your answer to the nearest tenth.
A. 82.3.
B. 71.7
C. 64.5
D. 86.4

Question

The speed that a car is going on a dry road when the driver puts on the breaks can be estimated by the equation s=√24d , where d is the distance that the car skids in feet. A car that was in an accident skidded 214 ft. Find the speed, in miles per hour, that a car was going before the accident occurred. Round your answer to the nearest tenth.
A. 82.3. 
B. 71.7 
C. 64.5 
D. 86.4