document.write( "Question 178183: The length of a rectangle is twice its width. Find its length if the perimeter is 84 feet. \n" ); document.write( "
Algebra.Com's Answer #133143 by Mathtut(3670)\"\" \"About 
You can put this solution on YOUR website!
P=2L+2W.....we are given P=84 and L=2W....lets plug em in
\n" ); document.write( ":
\n" ); document.write( "84=2(2W)+2W
\n" ); document.write( ":
\n" ); document.write( "84=4W+2W
\n" ); document.write( ":
\n" ); document.write( "84=6W
\n" ); document.write( ":
\n" ); document.write( "\"W=14\"
\n" ); document.write( ":
\n" ); document.write( "\"highlight%28L=2%2814%29=28%29\"feet
\n" ); document.write( "
\n" );