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OpenStudy (anonymous):
What is the sum of a 17–term arithmetic sequence where the first term is 9 and the last term is –87? please explain the formula –718 –739 –663 –644
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OpenStudy (anonymous):
\[\frac{ 17(9+-87) }{ 2 }\]
OpenStudy (anonymous):
what is that formula called?
OpenStudy (anonymous):
The formula for the sum of a finite arithmetic series.
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