document.write( "Question 987006: The length of a car's skid mark in feet is given by L=0.042s2−0.199s+0.264,where sis the car's speed in miles per hour. If the length of a skid mark is110feet, find the speed in miles per hour the car was traveling. \n" ); document.write( "
Algebra.Com's Answer #607845 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
The length of a car's skid mark in feet is given by L=0.042s2−0.199s+0.264, where
\n" ); document.write( " s is the car's speed in miles per hour.
\n" ); document.write( " If the length of a skid mark is 110feet, find the speed in miles per hour the car was traveling.
\n" ); document.write( ":
\n" ); document.write( "0.042s^2 − 0.199s + 0.264 = 110
\n" ); document.write( "0.042s^2 − 0.199s + 0.264 - 110 = 0
\n" ); document.write( "0.042s^2 − 0.199s - 109.736 = 0
\n" ); document.write( "Using the quadratic formula: \"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"
\n" ); document.write( "where in this equation a = .042; b = -.199; c = -109.736
\n" ); document.write( "I got a positive solution of:
\n" ); document.write( "s = 53.5391 mph
\n" ); document.write( ":
\n" ); document.write( "See if that is what you get. \n" ); document.write( "
\n" );