document.write( "Question 1096315: the rectangle has an area of 252 sq ft. side lengths are 21-5x and 7. find the value of x \n" ); document.write( "

Algebra.Com's Answer #710754 by Rhodium(14) $\"\"$ $\"About$

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As an equation, this is:\r
\n" ); document.write( "\n" ); document.write( "252 = (21 - 5x) * 7\r
\n" ); document.write( "\n" ); document.write( "Solve for x:\r
\n" ); document.write( "\n" ); document.write( "252 / 7 = (21 - 5x) * 7 / 7
\n" ); document.write( "252 / 7 = 21 - 5x
\n" ); document.write( "252 / 7 - 21 = 21 - 5x - 21
\n" ); document.write( "252 / 7 - 21 = 5x
\n" ); document.write( "x = (252 / 7 - 21) / 5\r
\n" ); document.write( "\n" ); document.write( "Simplify:\r
\n" ); document.write( "\n" ); document.write( "x = (252 / 7 - 21) / 5
\n" ); document.write( "x = (36 - 21) / 5
\n" ); document.write( "x = 15 / 5
\n" ); document.write( "x = 3\r
\n" ); document.write( "\n" ); document.write( "Convert to sq ft:\r
\n" ); document.write( "\n" ); document.write( "x = 3 sq ft. \n" ); document.write( "

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