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29-08-2017
Mathematics

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the perimeter of a trapezoid is 39a-7. Three sides have the following lengths: 9a, 5a-1, and 17a-6. What is the length of the fourth side

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coolstick coolstick

29-08-2017

Since there are 4 sides, the total minus the 3 other sides gives you the 4th side. 39a-7-9a is 30a-7, 30a-7-(5a-1)=30a-7-5a+1 (using the distributive property) =25a-6, 25a-6-(17a-6)=8a

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