Suppose the lengths of the four sides of a quadrilateral are represented by the expressions 3a, a + 2, 2a − 1, and 3a + 6. Write the sum of the lengths (the perimeter), and then simplify.

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1 Answer

Perimeter = sum of side lengths =

3a+a+2+2a-1+3a+6=

9a+7. Just count all the a’s and sum the numbers. Remember that the sign belongs to the number.

by Top Rated User (1.1m points)

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