3 years ago

The perimeter of a rectangle is 30 inches. if its length is three times its width, find the dimensions. answer key

1 answer:

5 0

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LekaFEV [45]

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pentagon [3]

$\sum\limits_{i=3}^{10}(2i-9)=2(3)-9+2(4)-9+2(5)-9+2(6)-9+2(7)-9\\\\+2(8)-9+2(9)-9+2(10)-9\\\\=6-9+8-9+10-9+12-9+14-9+16-9+18-9+20-9\\\\=90-72=18$

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