document.write( "Question 574817: 3-x/x-5 - 4x-7/5-x= \n" ); document.write( "
Algebra.Com's Answer #369302 by nerdybill(7384)\"\" \"About 
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A cellular phone company offers a contract for which the cost C, in dollars, of T minutes of telephoning is given by C=0.25(t-600)+50.95, where it is assumed that t is greater then or equal to 600 minutes. What time keeps the cost between $97.95 and $123.45?
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\n" ); document.write( "When C=97.95
\n" ); document.write( "97.95=0.25(t-600)+50.95
\n" ); document.write( "solving for t:
\n" ); document.write( "97.95=0.25t-150+50.95
\n" ); document.write( "97.95=0.25t-99.05
\n" ); document.write( "197=0.25t
\n" ); document.write( "788 minutes = t
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\n" ); document.write( "When C=123.45
\n" ); document.write( "123.45=0.25(t-600)+50.95
\n" ); document.write( "123.45=0.25t-150+50.95
\n" ); document.write( "123.45=0.25t-99.05
\n" ); document.write( "222.5 = 0.25t
\n" ); document.write( "890 = t
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\n" ); document.write( "answer: 788 minutes <= t <= 890 minutes\r
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