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OpenStudy (anonymous):
whta is the sum of the first 30 terms of this arithmetric sequence? 6,13,20,27,34
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OpenStudy (anonymous):
A.3225 B.3255 C3325 D.3525
OpenStudy (anonymous):
If I'm correct, it should be 3225, so A. I think you can write out the series as \[\sum_{i=1}^{30}6+(i-1)7\] And then you can find the last number in the series, which is 209. Add 209 and the first term, 6, then multiply by half of the terms. \[\frac{ 30 }{ 2 } (209+6)\]
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