Question

What is the explicit formula for this geometric sequence? 8,4, 2, 1, ...

Answer 1

Answer:

$a_{n}$ = 8 *$0.5^{n-1}$

Step-by-step explanation:

First find the common ratio

r = 4/8 = 1/2

and first term is 8

a_n = a_1 * r^(n-1)

a_n = 8 * (1/2)^(n-1)

$a_{n}$ = 8 *$0.5^{n-1}$