Question

PLEASE HELP multiple choice algebra question:

What is the explicit rule for the geometric sequence? 29.7, 9.9, 3.3, 1.1, ...


an=29.7(1/3)^n+1

an=29.7(1/3)^n−1

an=29.7(2/3)^n−1

an=29.7(1/3)^n

Answer 1

an=29.7(1/3)n-1

Explanation:

Answer 2

an=29.7(1/3)^(n−1)

Explanation:

The first and last choices fail on n=1.

The third choice fails on n=2.

The only viable choice is the second one, which describes the sequence perfectly.