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OpenStudy (anonymous):
Find the sum of the first 7 terms of the geometric series -3, 6, -12, … A. -381 B. -129 C. 129 D. 381
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OpenStudy (anonymous):
@primeralph
OpenStudy (primeralph):
use the formula S = n/2 * (2a +(n-1)*d )
OpenStudy (anonymous):
am i suppose to replace any letters with certain numbers?
OpenStudy (primeralph):
Yeah. Know them?
OpenStudy (anonymous):
i dont
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OpenStudy (primeralph):
Oh wait, I gave the wrong formula.
OpenStudy (primeralph):
|dw:1373498024576:dw|
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