document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=83124>Question 83124</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0321233832/algebrahomeworkh>Enementary and Intremediate Algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> page 140 problem 34\r<BR>\n" );
document.write( "\n" );
document.write( "Cost of Road Service Ricks Automotive charges $50.00 plus $15.00 for each (15 min.)unit of time when making a road call. Twin City Repair charges $70.00 plus $10.00 for each unit of time. Under what circumstances would it be more economical for a motorist to call Ricks? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #59775 by </B><A HREF=/tutors/aboutme.mpl?userid=ptaylor><B>ptaylor(2198)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ptaylor><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=ptaylor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=59775\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "Let t= number of units of time needed for the road call\r<BR>\n" );
document.write( "\n" );
document.write( "Now we know that it would be more economical to use Rick's if the total cost of the road call is less than Twin City\r<BR>\n" );
document.write( "\n" );
document.write( "So our equation to solve is:\r<BR>\n" );
document.write( "\n" );
document.write( "50+15t<70+10t  subtract 10t and also 50 from both sides\r<BR>\n" );
document.write( "\n" );
document.write( "50-50+15t-10t<70-50+10t-10t  collect like terms\r<BR>\n" );
document.write( "\n" );
document.write( "5t<20  divide both sides by 5\r<BR>\n" );
document.write( "\n" );
document.write( "t<4 units of time, in other words, if the road call takes less than an hour it would be more economical to use Rick's\r<BR>\n" );
document.write( "\n" );
document.write( "Clearly, if t=4 units of time, then the two would cost the same<BR>\n" );
document.write( "50+60=70+40<BR>\n" );
document.write( "110=110<BR>\n" );
document.write( "Hope this helps------ptaylor\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );