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OpenStudy (anonymous):
The length of the side of a rectangular desk is given by 7x - 9y cm. The length of the front is given by 7x + 9y cm. What is an algebraic expression for the area of the top of the rectangular desk? Include correct units as part of your answer.
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OpenStudy (anonymous):
area is length * width = (49x^2 - 81y^2) cm^2
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