document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1206953>Question 1206953</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The phone company, Splint, has a monthly cellular plan where the customer pays a flat monthly fee and then a cost of money per minute used on the phone. If the customer uses 360 minutes, the monthly cost is $126.00. If the customer uses 630 minutes, the monthly cost is $193.50.\r<BR>\n" );
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document.write( "Find a linear model of the form <BR>\n" );
document.write( " where <BR>\n" );
document.write( " is the number of monthly minutes used, and <BR>\n" );
document.write( " is the total monthly cost of the Splint plan.\r<BR>\n" );
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document.write( "Using the equation from part a., find the total monthly cost if 883 minutes are used.\r<BR>\n" );
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document.write( "If 883 minutes are used, the total cost will be <BR>\n" );
document.write( " dollars. </SPAN>\n" );
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document.write( "The phone company, Splint, has a monthly cellular plan where the customer pays a flat monthly fee <BR>\n" );
document.write( "and then a cost of money per minute used on the phone. If the customer uses 360 minutes, <BR>\n" );
document.write( "the monthly cost is $126.00. If the customer uses 630 minutes, the monthly cost is $193.50.<BR>\n" );
document.write( "Find a linear model of the form<BR>\n" );
document.write( "where<BR>\n" );
document.write( "is the number of monthly minutes used, and<BR>\n" );
document.write( "is the total monthly cost of the Splint plan.\r<BR>\n" );
document.write( "<BR>\n" );
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document.write( "Using the equation from part a., find the total monthly cost if 883 minutes are used.<BR>\n" );
document.write( "If 883 minutes are used, the total cost will be<BR>\n" );
document.write( "dollars.<BR>\n" );
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document.write( "<PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "From the problem, the difference 193.50-126.00 = 67.50 dollars corresponds to \r\n" );
document.write( "630-360 = 270 minutes of the phone call.\r\n" );
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document.write( "So, 1 minute of the fall call costs  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=67.50%2F270 ALIGN=MIDDLE  ALT=\"67.50%2F270\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 0.25 of a dollar.\r\n" );
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document.write( "Then the flat monthly fee is  126.00-0.25*360 = 36 dollars.\r\n" );
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document.write( "Thus the linear model is  C(t) = 36.00 + 0.25t,  where C(t)is the monthly fee,\r\n" );
document.write( "t is the monthly minutes.\r\n" );
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document.write( "If 883 minutes is used, then the monthly fee is  C(883) = 36.00 + 0.25*833 = 244.25 dollars.\r\n" );
document.write( "</PRE>\r<BR>\n" );
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document.write( "Solved.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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