document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=163953>Question 163953</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/9780495565215/algebrahomeworkh>College Algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> A cell phone company charges a monthly fee of $10 for the first 1000 text messages and 10 cents for each additional text message. Miriam's bill for text messages for the month of June is $38.50. How many text messages did she send that month?<BR>\n" );
document.write( "I can figure out the answer(1285 messages) but I don't know how to write the formula.<BR>\n" );
document.write( "Thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #120801 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=120801\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You have the formula in your head<BR>\n" );
document.write( "You just can't get it out<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b ALIGN=MIDDLE  ALT=\"b\"   DISABLED_style= \"max-width:90%; height:auto;\" >= Miriam's monthly bill<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t ALIGN=MIDDLE  ALT=\"t\"   DISABLED_style= \"max-width:90%; height:auto;\" >= the number of text messages sent in the<BR>\n" );
document.write( "month of June by Miriam<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+-+1000 ALIGN=MIDDLE  ALT=\"t+-+1000\"   DISABLED_style= \"max-width:90%; height:auto;\" >= the number of text messages over <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1000 ALIGN=MIDDLE  ALT=\"1000\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Miriam's monthly bill is:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b+=+10+%2B+.1%2A%28t+-+1000%29 ALIGN=MIDDLE  ALT=\"b+=+10+%2B+.1%2A%28t+-+1000%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > dollars<BR>\n" );
document.write( "Her monthly bill is $38.50. I'll show it in terms of cents<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3850+=+1000+%2B+10%2A%28t+-+1000%29 ALIGN=MIDDLE  ALT=\"3850+=+1000+%2B+10%2A%28t+-+1000%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > cents<BR>\n" );
document.write( "Subtract <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1000 ALIGN=MIDDLE  ALT=\"1000\"   DISABLED_style= \"max-width:90%; height:auto;\" > from both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2850+=+10%2A%28t+-+1000%29 ALIGN=MIDDLE  ALT=\"2850+=+10%2A%28t+-+1000%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2850+=+10t+-+10000 ALIGN=MIDDLE  ALT=\"2850+=+10t+-+10000\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Add <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10000 ALIGN=MIDDLE  ALT=\"10000\"   DISABLED_style= \"max-width:90%; height:auto;\" > to both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=12850+=+10t ALIGN=MIDDLE  ALT=\"12850+=+10t\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+1285 ALIGN=MIDDLE  ALT=\"t+=+1285\"   DISABLED_style= \"max-width:90%; height:auto;\" > messages<BR>\n" );
document.write( "----------------------------<BR>\n" );
document.write( "It might help to go over the units involved in the 1st<BR>\n" );
document.write( "formula which was<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b+=+10+%2B+.1%2A%28t+-+1000%29 ALIGN=MIDDLE  ALT=\"b+=+10+%2B+.1%2A%28t+-+1000%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > dollars<BR>\n" );
document.write( "The <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10 ALIGN=MIDDLE  ALT=\"10\"   DISABLED_style= \"max-width:90%; height:auto;\" > really stands for ($10/1000 messages)x(1000 messages)<BR>\n" );
document.write( "And the other term is really (.1 dollars/message)x(t - 1000 messages)<BR>\n" );
document.write( "The units work out to dollars for both terms<BR>\n" );
document.write( "----------------------------<BR>\n" );
document.write( "You can check the answer<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3850+=+1000+%2B+10%2A%28t+-+1000%29 ALIGN=MIDDLE  ALT=\"3850+=+1000+%2B+10%2A%28t+-+1000%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3850+=+1000+%2B+10%2A%281285+-+1000%29 ALIGN=MIDDLE  ALT=\"3850+=+1000+%2B+10%2A%281285+-+1000%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3850+=+1000+%2B+10%2A285 ALIGN=MIDDLE  ALT=\"3850+=+1000+%2B+10%2A285\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3850+=+1000+%2B+2850 ALIGN=MIDDLE  ALT=\"3850+=+1000+%2B+2850\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3850+=+3850 ALIGN=MIDDLE  ALT=\"3850+=+3850\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK<BR>\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );