6.9k views
22 votes
Find the 15th term of the geometric sequence 9,18,36

User AVEbrahimi
by
9.2k points

1 Answer

2 votes

Answer:

147,456

Geometric sequence: 9, 18, 36

Common ratio = r = 18/9 = 2

First term : a_1 = 9

Nth term : a_n = a_1 * r^(n - 1)

a_n = 9 * (2)^(n -1)

We want a_15, the 15th term

a_15 = 9*2^(15 -1)

a_15 = 9*2^14 = 9*16,384 = 147,456‬

User Amr Ellafy
by
8.0k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories