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OpenStudy (anonymous):
What is the sum of a 17–term arithmetic sequence where the first term is 6 and the last term is –90? Choices –813 –790 –765 –714
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OpenStudy (mertsj):
\[\S=\frac{n}{2}(a _{1}+a _{n})\]
OpenStudy (anonymous):
-714 is the answer
OpenStudy (anonymous):
am i right ?
OpenStudy (mertsj):
\[\frac{17}{2}(6-90)=-714\]
OpenStudy (anonymous):
thats what i got so thank you i understand
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hero (hero):
:D
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