SOLUTION: Sum of the first 10th terms of the geometric sequence -8,-4,-2,...

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Question 865202: Sum of the first 10th terms of the geometric sequence -8,-4,-2,...
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
r=1/2
S=t*(1 - r^n)/(1 - r)
S10=-8*(1 - 1/2^10)/(1 - 1/2)
S10=-1023/64
Tn = t * r^(n - 1)
T = -8 * 1/2^(9)
T10=-1/64