Question

Determine if the sequence is geometric. If it is, find the term named in the problem.

25.) 4, 8, 16, 32, ...
Find a9 (9 is a lowered power to a)

Answer 1

120

Explanation:

Each new term is twice the previous term, so this is a geometric sequence. The applicable formula is

a(n) = a(1)*4*(n - 1)

and so a(9) = 4*4(9 - 1) = 120