document.write( "Question 439471: Could someone please show me how to solve this? A cellular phone company offers a contract for which the C, in dollars, of the t minutes of telephoning is given by C=0.25(t-300)+42.95. Where it is assumed that t is less than or equal to 300 minutes. What time will keep the costs between $84.95 and $114.45 the telephoning time must be between _ and _ minutes \n" ); document.write( "

Algebra.Com's Answer #303718 by stanbon(75887) $\"\"$ $\"About$

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Could someone please show me how to solve this? A cellular phone company offers a contract for which the C, in dollars, of the t minutes of telephoning is given by C=0.25(t-300)+42.95. Where it is assumed that t is less than or equal to 300 minutes. What time will keep the costs between $84.95 and $114.45 the telephoning time must be between _ and _ minutes
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\n" ); document.write( "t <= 300
\n" ); document.write( "84.95 <= 0.25(t-300)+42.95 <= 114.45
\n" ); document.write( "---
\n" ); document.write( "Subtract 42.95 along the line to get:
\n" ); document.write( "42.50 <= 0.25(t-300) <= 71.5
\n" ); document.write( "---
\n" ); document.write( "Divide thru by 0.25 to get:
\n" ); document.write( "170 <= t-300 <= 286
\n" ); document.write( "---
\n" ); document.write( "Add 300 to get:
\n" ); document.write( "470 <= t <= 586
\n" ); document.write( "---
\n" ); document.write( "But t <=300
\n" ); document.write( "==============
\n" ); document.write( "Hummmmmm????
\n" ); document.write( "====================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( " \n" ); document.write( "

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