Question

How do you find the indicated term for the geometric sequence `a_1=7`, r=2, n=4?

Answer 1

Use the formula:

`a_n=a_1r^(n-1)`

Explanation:

Substitute 7 for `a_1`, 2 for r, and 4 for n:

`a_4=7(2)^(4-1)`

`a_4= 56`