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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? please help?
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OpenStudy (anonymous):
Is there a formula for this?
OpenStudy (dumbcow):
didn't i already help you with this one??
OpenStudy (anonymous):
ya but it was wrong :/
OpenStudy (dumbcow):
-714
OpenStudy (anonymous):
Okay! thank you so much. yeah that's a different answer than the one from last time. thank you
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OpenStudy (dumbcow):
i gave you the formula Sn = n(A1+An)/2
OpenStudy (dumbcow):
= 17(6-90)/2 = 17(-84)/2 = -714
OpenStudy (anonymous):
Oh sorry. lol I thought you meant 17 was the answer but now i get it. Thank you for giving me the equation too!
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