document.write( "Question 42113: The perimeter of a rectangle is 420 inches. The width is 4 inches less than the length. What is the length of the rectangle? \n" ); document.write( "
Algebra.Com's Answer #27245 by tutorcecilia(2152)\"\" \"About 
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The formula for the perimeter is:
\n" ); document.write( "Perimeter = 2(length + width)
\n" ); document.write( "P = 2(l+w)
\n" ); document.write( ".
\n" ); document.write( "Plug in the known and unknown values:
\n" ); document.write( "P = 420
\n" ); document.write( "Length = x
\n" ); document.write( "Width = (length-4)=(x-4)
\n" ); document.write( ".
\n" ); document.write( "420 = 2[x + (x - 4)]
\n" ); document.write( ".
\n" ); document.write( "Simplify and solve for x:
\n" ); document.write( "420 = 2(2x - 4)
\n" ); document.write( "420 = 4x - 8
\n" ); document.write( "420+8 = 4x -8 + 8
\n" ); document.write( "428 = 4x
\n" ); document.write( "428/4 = 4x/4
\n" ); document.write( "107=x
\n" ); document.write( "Plug-in x = 107 to check.
\n" ); document.write( "420 = 2(107 + (107-4))
\n" ); document.write( "420 = 2(107 + 103)
\n" ); document.write( "420 = 2(210)
\n" ); document.write( "420=420
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