document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1176722>Question 1176722</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A wireless carrier offers the following plans that a person is considering. <BR>\n" );
document.write( "The Family Plan: $90 monthly fee, unlimited talk and text on up to 8 lines, and data charges of $40 for each device for <BR>\n" );
document.write( "up to 2 GB of data per device. The Mobile Share Plan: $120 monthly fee for up to 10 devices, unlimited talk and text <BR>\n" );
document.write( "for all the lines, and data charges of $35 for each device up to a shared total of 10 GB of data. Use P for the number of <BR>\n" );
document.write( "devices that need data plans as part of their cost.<BR>\n" );
document.write( "Find the model of the total cost of the Family Plan </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #850566 by </B><A HREF=/tutors/aboutme.mpl?userid=CPhill><B>CPhill(1959)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=CPhill><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=CPhill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=850566\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let's break down the cost of the Family Plan and create a model.\r<BR>\n" );
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document.write( "**Understanding the Family Plan**\r<BR>\n" );
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document.write( "* **Monthly Fee:** $90 (fixed cost)<BR>\n" );
document.write( "* **Unlimited Talk and Text:** Included for up to 8 lines<BR>\n" );
document.write( "* **Data Charges:** $40 per device (up to 2 GB per device)<BR>\n" );
document.write( "* **Number of Devices with Data:** P\r<BR>\n" );
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document.write( "**Building the Cost Model**\r<BR>\n" );
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document.write( "1.  **Fixed Cost:** The $90 monthly fee is a constant, regardless of the number of devices.\r<BR>\n" );
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document.write( "2.  **Variable Cost:** The data charge is $40 per device, and we have P devices. So, the data cost is $40 * P.\r<BR>\n" );
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document.write( "3.  **Total Cost:** To find the total cost, we add the fixed cost and the variable cost.\r<BR>\n" );
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document.write( "**The Model**\r<BR>\n" );
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document.write( "The total cost (C) of the Family Plan can be represented by the following equation:\r<BR>\n" );
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document.write( "* **C = 90 + 40P**\r<BR>\n" );
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document.write( "Where:\r<BR>\n" );
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document.write( "* C = total monthly cost<BR>\n" );
document.write( "* P = number of devices with data plans<BR>\n" );
document.write( " </SPAN>\n" );
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