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OpenStudy (anonymous):
Please help :'c What is the sum of an 8-term geometric series if the first term is 12 and the last term is -3,359,232? Should I find the ratio first? And then solve for the sum with the geometric series formula?
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OpenStudy (anonymous):
I found r=-6
OpenStudy (anonymous):
find r by the formula \[an=ar ^{n-1}\] then calculate S8 by the formula given in previous problem.
OpenStudy (anonymous):
I got -3359232 by solving it that way and this is a choice. thank you :D
OpenStudy (anonymous):
yw
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