document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=253412>Question 253412</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A sport store sells about 50 mountain bikes per month at a price of $220 each.  For each $20 decrease in price, about 10 more bikes per month are sold.  Write a quadratic function in standard form that models the revenue from bike sales.  What price produces the maximum revenue? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #185728 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=185728\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> y=mx+b<BR>\n" );
document.write( "220=-2*50+b<BR>\n" );
document.write( "320=b<BR>\n" );
document.write( "y=-2x+320<BR>\n" );
document.write( "This a linear equation not quadratic. \r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );