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OpenStudy (anonymous):
What is the sum of a 7-term geometric series if the first term is -11, the last term is -171,875, and the common ratio is -5? a.-143,231 b.-36,047 c.144,177 d.716,144
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OpenStudy (anonymous):
-11*-5^(7-1) = 859374.. what did I do wrong?
OpenStudy (dan815):
geometic series means u multilping by common ratio every time
OpenStudy (anonymous):
sum of 7 terms is S= (-11)[((-5)^7)-1]/(-5-1) (-11)[-78125-1]/(-6) =-39063
OpenStudy (dan815):
|dw:1375340391729:dw|
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