document.write( "Question 964310: The perimeter of a parallelogram is 31 meters. The length is 7a and the width is 12 + 10a. Find a.
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Algebra.Com's Answer #589190 by EdenWolf(517) $\"\"$ $\"About$

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The equation for the perimeter is $\"2a%2B2b=P\"$ , so plug in what you know into the equation.
\n" ); document.write( " $\"2%287a%29%2B2%2810a%2B12%29=31\"$
\n" ); document.write( "Now solve for a.
\n" ); document.write( " $\"14a%2B20a%2B24=31\"$
\n" ); document.write( " $\"34a%2B24=31\"$
\n" ); document.write( " $\"34a=7\"$
\n" ); document.write( " $\"a=%287%2F34%29\"$ \n" ); document.write( "

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