document.write( "Question 337773: Beth has 4500 feet of fencing available to enclose a rectangular field. One side of the field lies along a river, so only three sides require fencing. Express the area A of the rectangle as a function of x, where x is the length of the side parallel to the river. \n" ); document.write( "

Algebra.Com's Answer #242171 by Fombitz(32388) $\"\"$ $\"About$

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$\"P=W%2Bx%2BW=2W%2Bx=4500\"$
\n" ); document.write( "From that,
\n" ); document.write( " $\"2W=4500-x\"$
\n" ); document.write( " $\"W=%284500-x%29%2F2\"$
\n" ); document.write( "The area of a rectangle is,
\n" ); document.write( " $\"A=W%2Ax\"$
\n" ); document.write( " $\"A=%28%284500-x%29x%29%2F2\"$
\n" ); document.write( " \n" ); document.write( "

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