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anonymous
 5 years ago
What is the sum of an 8–term geometric series if the first term is –11, the last term is 859,375, and the common ratio is –5?
–143,231
716,144
144,177
–36,047
anonymous
 5 years ago
What is the sum of an 8–term geometric series if the first term is –11, the last term is 859,375, and the common ratio is –5? –143,231 716,144 144,177 –36,047

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0what formula you used? \[S=a\frac{1r^n}{1r}\] this?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0No it looks like: a1  a1 (r)^n Sn = _______________ 1  r

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i calculated wrongly, you are correct, sorry

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Haha it's ok, thank you

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i calculated as \[S=a\frac{r^n1}{1r}\] mixed r^n and 1 ><

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ty!!! This was correct!
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