document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=161561>Question 161561</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/9780073533490/algebrahomeworkh>ELEMENTARY AND INTERMEDIATE ALGEBRA</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> The cost C for installing ceramic floor tile in a rectangular<BR>\n" );
document.write( "room varies jointly with the length L and width W of the room.<BR>\n" );
document.write( "a) Write a formula for this variation.<BR>\n" );
document.write( "b) The cost is $400 for a room that is 8 feet by 10 feet.<BR>\n" );
document.write( "What is the cost for a room that is 11 feet by 14 feet? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #119031 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=119031\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The cost C for installing ceramic floor tile in a rectangular<BR>\n" );
document.write( "room varies jointly with the length L and width W of the room.<BR>\n" );
document.write( "a) Write a formula for this variation.<BR>\n" );
document.write( "b) The cost is $400 for a room that is 8 feet by 10 feet.<BR>\n" );
document.write( "What is the cost for a room that is 11 feet by 14 feet?<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "a) Cost = kL*W  (k = cost per square foot)<BR>\n" );
document.write( "b) 400 = k*8*10 = 80k<BR>\n" );
document.write( "k = $5/sq foot<BR>\n" );
document.write( "Cost of the room = $5*11*14<BR>\n" );
document.write( "Cost = $770<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );