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Mathematics 13 Online
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

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

OpenStudy (primeralph):

Oh wait, I gave the wrong formula.

OpenStudy (primeralph):

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