We are finding the sum of the first five terms of a geometric sequence, therefore we are looking for and the formula to be used is the geometric series:
However, we still need to find the common ratio or r, and remember that this is constant between each consecutive term. Simply divide the 2nd term and 1st term:
With as 7, n as 5 and r as 3, substitute these values into the formula of geometric series:
Answers & Comments
Answer:
my answer was 567 lol
Step-by-step explanation:
7×3=21
21×3 =63
63×3=189
189×3=567
Answer:
We are finding the sum of the first five terms of a geometric sequence, therefore we are looking for
and the formula to be used is the geometric series:
However, we still need to find the common ratio or r, and remember that this is constant between each consecutive term. Simply divide the 2nd term and 1st term:
With
as 7, n as 5 and r as 3, substitute these values into the formula of geometric series:
Therefore, the answer is A. 847.
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