document.write( "Question 517650: harriet wants to put up fencing around three sides of her rectangular yard and leave a side of 20 feet unfenced. If the yard has an area of 680 square feet, how many feet of fencing does she need ?\r
\n" ); document.write( "\n" ); document.write( "a)34
\n" ); document.write( "b)40
\n" ); document.write( "c)68
\n" ); document.write( "d)88
\n" ); document.write( "e)102\r
\n" ); document.write( "\n" ); document.write( "Note : I Know the Answer but I dont kno How to solve Please help me .
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Algebra.Com's Answer #344875 by ankor@dixie-net.com(22740)\"\" \"About 
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harriet wants to put up fencing around three sides of her rectangular yard and leave a side of 20 feet unfenced.
\n" ); document.write( " If the yard has an area of 680 square feet, how many feet of fencing does she need ?
\n" ); document.write( ":
\n" ); document.write( "We're told that one side is 20 ft, by the fact that a 20 ft side is unfenced;
\n" ); document.write( "Assume W = 20'
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\n" ); document.write( "Area: L * W = 680
\n" ); document.write( "20*L = 680
\n" ); document.write( "L = 680/20
\n" ); document.write( "L = 34' is the length, (the yard is 34 by 20)
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\n" ); document.write( "Perimeter: P = 2L + 2W, we only have 3 sides to fence, therefore
\n" ); document.write( "Fence = 2L + W
\n" ); document.write( "Fence = 2(34) + 20 = 88' ft of fence required
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