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OpenStudy (anonymous):
What is the sum of the geometric sequence 8, –16, 32 … if there are 15 terms?
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OpenStudy (anonymous):
wouldnt the answer be 87,384
OpenStudy (anonymous):
thats what i got but im not sure if its right
OpenStudy (callisto):
a=8 r=-2 n=15 sum = a(r^n -1) /(r-1) = 8 [(-2)^15 -1] / [(-2)-1] = 87384 sorry you're right
OpenStudy (anonymous):
alright thanks!
OpenStudy (callisto):
you're welcome
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