document.write( "Question 1141698: A model for the braking distance, d feet, required to stop a certain car when it is traveling x miles per hour is \"+d=%28x%5E2%2F20%29%2Bx+\". According to this model, what is the braking distance, in feet, required to stop this car when it is traveling 30 mph? \n" ); document.write( "
Algebra.Com's Answer #762285 by ankor@dixie-net.com(22740)\"\" \"About 
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A model for the braking distance, d feet, required to stop a certain car when it is traveling x miles per hour is \"+d=%28x%5E2%2F20%29%2Bx+\". According to this model, what is the braking distance, in feet, required to stop this car when it is traveling 30 mph?
\n" ); document.write( ":
\n" ); document.write( "\"+d=%28x%5E2%2F20%29%2Bx+\"
\n" ); document.write( "x=30
\n" ); document.write( "\"+d=%2830%5E2%2F20%29%2B30+\"
\n" ); document.write( "\"+d=%28900%2F20%29%2B30+\"
\n" ); document.write( "\"+d=45%2B30+\"
\n" ); document.write( "d = 75ft to stop going 30 mph
\n" ); document.write( "
\n" );