document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1125249>Question 1125249</A>: <I><SPAN STYLE=\"word-break: break-all;\"> You are choosing between two different prepaid cell phone plans. The first plan charges a rate of 34 cents per minute. The second plan charges a monthly fee of $19.95 plus 13 cents per minute. How many minutes would you have to use in a month in order for the second plan to be preferable?<BR>\n" );
document.write( "You would have to use more than  <BR>\n" );
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document.write( "minutes in a month.\r<BR>\n" );
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document.write( "Begin by writing linear modeling functions for the cost C for each cell phone plan in terms of t minutes having the form <BR>\n" );
document.write( "C = mt + b.<BR>\n" );
document.write( " What is the interpretation of the point of intersection for the two modeling functions? If two functions have the same output C, what is a method for solving for the input t? Interpret the cost of each cell plan when t is greater than and when t is less than its intersection point value. </SPAN>\n" );
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document.write( " The first plan charges a rate of 34 cents per minute. The second plan charges a monthly fee of $19.95 plus 13 cents per minute. How many minutes would you have to use in a month in order for the second plan to be preferable?<BR>\n" );
document.write( "...\r<BR>\n" );
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document.write( "Begin by writing linear modeling functions for the cost C for each cell phone plan in terms of t minutes having the form <BR>\n" );
document.write( "C = mt + b.<BR>\n" );
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document.write( "First Plan<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=34%2At ALIGN=MIDDLE  ALT=\"34%2At\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Second Plan<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=13t%2B19.95 ALIGN=MIDDLE  ALT=\"13t%2B19.95\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Want the second plan to be preferable.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=13t%2B19.95%3C34t ALIGN=MIDDLE  ALT=\"13t%2B19.95%3C34t\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Solve this for t. </SPAN>\n" );
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