document.write( "Question 270392: in maryland speed fine are determined by formula f=10(x-65) +50 where f is the cost in dollar of the fine if a person is caught drriving x miles per hours.
\n" ); document.write( "a fine comes to $400. how fast was the person speeding
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Algebra.Com's Answer #198119 by checkley77(12844)\"\" \"About 
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f=10(x-65)+50
\n" ); document.write( "400=10(x-65)+50
\n" ); document.write( "400=10x-650+50
\n" ); document.write( "10x=400+650-50
\n" ); document.write( "10x=1,000
\n" ); document.write( "x=1,000/10
\n" ); document.write( "x=100 mph. was the speed.
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