document.write( "Question 138767: A cellular phone compnay offers a contract for which the cost C, in dollars, of t minutes of telephoning is given by C=0.25(t-300)+46.95, where it is assumed that t>300 minutes. What times will keep cost between $ 95.20 and $124.20?\r
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document.write( "For the cost to be between $ 95.20 adn $124.20,the telephoning times must be between ___ minutes and ___ minutes. \n" );
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Algebra.Com's Answer #101248 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! C=0.25(t-300)+46.95, where it is assumed that t>300 minutes. What times will keep cost between $ 95.20 and $124.20? \n" ); document.write( "------------------------------------------- \n" ); document.write( "95.20 < 0.25(t-300) + 46.95 < 124.20\r \n" ); document.write( "\n" ); document.write( "Subtract 46.95 along the line to get:\r \n" ); document.write( "\n" ); document.write( "48.25 < 0.25(t-300) < 77.25\r \n" ); document.write( "\n" ); document.write( "Divide thru by 0.25 to get: \n" ); document.write( "193 < t-300 < 309 \n" ); document.write( "Add 300 along the line to get: \n" ); document.write( "493 < t < 609 \n" ); document.write( "-------------------------- \n" ); document.write( "If you assume t>300 the answer becomes: \n" ); document.write( "300 < t < 609 \n" ); document.write( "================== \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " |