Question

What is the sum of the geometric sequence 4, 12, 36 . if there are 9 terms?

Answer 1

Please show your work

Answer 2

Sum = (first term) (1 - (ratio)^(number of terms)) / (1 - ratio)

Answer 3

I know the equation, I just can't get it to come out right for the life of me.

Answer 4

sum = 4 (1 - 3^9) / (1 - 3)

If you look at the terms, the common ratio is 3

Answer 5

ok

Answer 6

Thanks I see where I messed up