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OpenStudy (anonymous):
HELPPPP! What is the sum of the first 30 terms of this arithmetic sequence? 6, 13, 20, 27, 34, …
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sam (.sam.):
do you remember the summation formula for ap?
OpenStudy (anonymous):
No /:
sam (.sam.):
\[s_n=\frac{n}{2}[2a+(n-1)d]\] a, would be first term, 6 n is 30 d is the difference, 13-6=7
OpenStudy (anonymous):
|dw:1368628877536:dw|
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