document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=447762>Question 447762</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me!!!!!!!!<BR>\n" );
document.write( " Solve. Please show the algebraic inequality you used and show all of your work.<BR>\n" );
document.write( "Two cell phone companies are advertising rates. Company A charges a rate of $20 per month plus $0.05 per minute. Company B charges a rate of $10 per month plus $0.10 per minute. What is the number of minutes used above which Company A costs more than Company B? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #308312 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=308312\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Two cell phone companies are advertising rates.<BR>\n" );
document.write( " Company A charges a rate of $20 per month plus $0.05 per minute.<BR>\n" );
document.write( " Company B charges a rate of $10 per month plus $0.10 per minute.<BR>\n" );
document.write( " What is the number of minutes used above which Company A costs more than Company B?<BR>\n" );
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document.write( "Let m = no. of minutes for this to be true<BR>\n" );
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document.write( "Write an cost equation for each plan<BR>\n" );
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document.write( "\"Company A charges a rate of $20 per month plus $0.05 per minute.\"<BR>\n" );
document.write( "Cost A = .05m + 20<BR>\n" );
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document.write( "\"Company B charges a rate of $10 per month plus $0.10 per minute.\"<BR>\n" );
document.write( "Cost B = .10m + 10<BR>\n" );
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document.write( "What is the number of minutes used above which Company A costs more than Company B?<BR>\n" );
document.write( "Cost A > Cost B<BR>\n" );
document.write( "which is<BR>\n" );
document.write( ".05m + 20 > .10m + 10<BR>\n" );
document.write( ".05m - .10m > 10 - 20<BR>\n" );
document.write( "-.05m > -10<BR>\n" );
document.write( "We need to get rid of the negatives, multiply by -1, this reverses the inequality sign<BR>\n" );
document.write( ".05m < 10<BR>\n" );
document.write( "m < <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10%2F.05 ALIGN=MIDDLE  ALT=\"10%2F.05\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "m < 200<BR>\n" );
document.write( "We can translate this to the statement<BR>\n" );
document.write( "\"Plan A cost more than Plan B when you use less than 200 min\"<BR>\n" );
document.write( "or<BR>\n" );
document.write( "\"Plan A cost less than Plan B when you exceed 200 min\"<BR>\n" );
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document.write( "Let's see if that is true:<BR>\n" );
document.write( "If you use 201 min<BR>\n" );
document.write( "A = .05(201) + 20 = $30.05<BR>\n" );
document.write( "B + .10(201) + 10 = $30.10 </SPAN>\n" );
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