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The formula r=2sqrt(...)5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will Acari skid at 20 mph?

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looks like yours, just input 20 instead of the 60

forgot the link

http://www.jiskha.com/display.cgi?id=1329034595

The car left skid marks of 97'

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