document.write( "Question 994233: The cell phone crevice for a business executive is $80 per month plus $0.40 per minute of phone use over 900 min. In a month when the executive's cell phone bill was $110.40, how many minutes did the executive use the phone? \r
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document.write( "My teacher didn't teach us how to solve these sorts of problems so I'm really stuck. Thank you for taking time to help! \n" );
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Algebra.Com's Answer #628641 by macston(5194)![]() ![]() You can put this solution on YOUR website! . \n" ); document.write( "x=total minutes of use \n" ); document.write( ". \n" ); document.write( "When x>900: \n" ); document.write( "Bill=$80+$0.40(x-900) \n" ); document.write( "Bill=$80+$0.40x-$360 \n" ); document.write( "Bill=$0.40x-$280 \n" ); document.write( ". \n" ); document.write( "$110.40=$0.40x-$280 \n" ); document.write( "$390.40=$0.40x \n" ); document.write( "976=x \n" ); document.write( "ANSWER: He used the phone 976 minutes. \n" ); document.write( " |