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OpenStudy (anonymous):
What is the sum of a 17-term arithmetic sequence where the first term is 8 and the last term is -88? -542 -680 -893 -954
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OpenStudy (ddcamp):
Sum of an arithmetic sequence = \[\frac{ 1 }{ 2 }(Number\ of\ terms)(First\ term+Last\ term)\] \[=\frac{ 1 }{ 2 }(17)(-88 + 8) = 8.5(-80) = -680\]
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