document.write( "Question 318021: cost=0.25(t-500)+$49.95 cell phone contract. It is assumed that t>/500 minutes. For the cost to be between $97.20 and $121.95, the telephone time must be between \n" ); document.write( "

Algebra.Com's Answer #227691 by stanbon(75887) $\"\"$ $\"About$

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cost=0.25(t-500)+$49.95 cell phone contract. It is assumed that t>/500 minutes. For the cost to be between $97.20 and $121.95, the telephone time must be between
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\n" ); document.write( "Solve: 97.20 < 0.25(t-500)+$49.95 < 121.95
\n" ); document.write( "---
\n" ); document.write( "Subtract 49.95 along the line:
\n" ); document.write( "47.20 < 0.25(t-500) < 72
\n" ); document.write( "---
\n" ); document.write( "Divide by 0.25 along the line:
\n" ); document.write( "188.80 < t-500 < 288
\n" ); document.write( "---
\n" ); document.write( "Add 500 along the line:
\n" ); document.write( "688.80 < t < 788
\n" ); document.write( "==========================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( "========================== \n" ); document.write( "

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