document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=139514>Question 139514</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Sprint has a long distance phone plan that charges a monthly fee of $9.99 plus $0.03 per minute. <BR>\n" );
document.write( "    (a) Write down the equation for monthly bill as a function of minutes used. <BR>\n" );
document.write( "    (b)   Identify dependent and independent variables.<BR>\n" );
document.write( "    (c)   Graph the function.<BR>\n" );
document.write( "    (d)  What is the monthly bill if 255 minutes are used for long distance     phone calls?<BR>\n" );
document.write( "   (e)    How many minutes were used for long distance if the long distance phone bill was  $ 40.50?<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #101702 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=101702\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Sprint has a long distance phone plan that charges a monthly fee of $9.99 plus $0.03 per minute. <BR>\n" );
document.write( "(a) Write down the equation for monthly bill as a function of minutes used.<BR>\n" );
document.write( "Bill(x) = 9.99 + 0.03x<BR>\n" );
document.write( "-------------------- <BR>\n" );
document.write( "(b) Identify dependent and independent variables.<BR>\n" );
document.write( "independent: minutes<BR>\n" );
document.write( "dependent: bill<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "(c) Graph the function.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28400%2C300%2C-5%2C40%2C-5%2C15%2C9.99%2B0.03x%29 ALIGN=MIDDLE  ALT=\"graph%28400%2C300%2C-5%2C40%2C-5%2C15%2C9.99%2B0.03x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "(d) What is the monthly bill if 255 minutes are used for long distance phone calls?<BR>\n" );
document.write( "bill(255) = 9.99+0.03*255=17.64<BR>\n" );
document.write( "----------------------<BR>\n" );
document.write( "(e) How many minutes were used for long distance if the long distance phone bill was $ 40.50?<BR>\n" );
document.write( "40.50 = 9.99 + 0.03x<BR>\n" );
document.write( "0.03x = 40.50- 9.99<BR>\n" );
document.write( "x = 1017 minutes<BR>\n" );
document.write( "======================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );