document.write( "Question 417943: the width of a rectangle is fixed at 21 cm. What lengths will make the perimeter
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Algebra.Com's Answer #292543 by praseenakos@yahoo.com(507)\"\" \"About 
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P = 2(length + width)\r
\n" ); document.write( "\n" ); document.write( "\"90+=+2%28+length+%2B+21%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"90%2F2+=+2%28+length+%2B+21%29%2F2\"\r
\n" ); document.write( "\n" ); document.write( "\"+45+=+length+%2B+21\"\r
\n" ); document.write( "\n" ); document.write( "\"+45+-21+=+length+%2B+21-21\"\r
\n" ); document.write( "\n" ); document.write( "\"+24+=+length+\" which makes the perimeter 90
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