document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=146433>Question 146433</A>: <I><SPAN STYLE=\"word-break: break-all;\"> hope someone could help me with this\r<BR>\n" );
document.write( "\n" );
document.write( "Suppose a farmer has 160 feet of fencing to make a rectangular barnyard enclosure. If the enclosure is x feet long, express the area A of the enclosure as a function of the length. Give an answer by describing your solution. <BR>\n" );
document.write( "The solution is one of the following:\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "1.	A(x) = x^2 – 40x\r<BR>\n" );
document.write( "\n" );
document.write( "2.	B. A(x)= square root 25,600-x^2	 \r<BR>\n" );
document.write( "\n" );
document.write( "3.	A(x) = 160x – x^2\r<BR>\n" );
document.write( "\n" );
document.write( "4.	A(x) = 80x – x^2\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Which one do you think is correct? show your work<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 #106905 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=106905\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Since, perimeter is:<BR>\n" );
document.write( "L+L+W+W<BR>\n" );
document.write( "or <BR>\n" );
document.write( "2(L+W)<BR>\n" );
document.write( "The problem GAVE us the length as x.<BR>\n" );
document.write( "2(x+W)<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Since the problem told us that the total length of fencing is 160 feet we have:<BR>\n" );
document.write( "160 = 2(x+W)<BR>\n" );
document.write( "Solving for W:<BR>\n" );
document.write( "80 = x+W<BR>\n" );
document.write( "80 - x = W<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Well, we all know that the area of a rectangle is length*width we get:<BR>\n" );
document.write( "x(80 - x)<BR>\n" );
document.write( "= 80x - x^2<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );