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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?
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OpenStudy (aum):
Sum of an arithmetic sequence = (first term + last term) /2 * Number of terms
OpenStudy (anonymous):
how would you set that up?? im confused
OpenStudy (aum):
\( \Large \text{Sum = }\frac{9 ~+~ (-87)}2{} * 17 \)
OpenStudy (anonymous):
-663
OpenStudy (aum):
Yes.
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OpenStudy (anonymous):
thankss
OpenStudy (aum):
yw.
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