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Mathematics 8 Online
OpenStudy (anonymous):

Write the series in summation notation: -2 + 4 - 6 + 8 - 10 + 12 https://accelerate-ghchs.brainhoney.com/MathML/Image.ashx?data=%24%5cunderset%7bk+%3d+1%7d%5coverset%7b6%7d%7b%5cLARGE%5cSigma%7d%7b%5cleft(-1%5cright)%7d%5e%7bk%7d%5cleft(2k%5cright)%24

OpenStudy (anonymous):

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