document.write( "Question 218148: The formula r = 2(sqrt of 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 a car skid going 50 miles per hour? \n" ); document.write( "
Algebra.Com's Answer #164368 by RAY100(1637)\"\" \"About 
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r= 2*sqrt(5L)
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\n" ); document.write( "for r=50
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\n" ); document.write( "50 =2*sqrt(5L)
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\n" ); document.write( "25= sqrt(5L),,,,square both sides
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\n" ); document.write( "625 = 5L
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\n" ); document.write( "125 ft = L
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\n" ); document.write( "check,,,r= 2*sqrt(5*125) = 2*sqrt625 = 2*25 =50,,,,,ok
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