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OpenStudy (anonymous):
please help im trying to finish a final and dont know this What is the sum of the geometric sequence -3, 18, -108, ... if there are 7 terms? -719,835 -119,973 119,973 719,835
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OpenStudy (anonymous):
It seems that r=-6, so \[ a_1=-3\\ a_n= -6 a_{n-1} \]
OpenStudy (anonymous):
Here are the first 7 terms {-3, 18, -108, 648, -3888, 23328, -139968}
OpenStudy (anonymous):
Their total is -119973
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