Question

In the 1st generation, there are 4 monkeys on the island.....

Answer 1

you're answer is letter D.

Explanation:

Answer 2

General explicit formula:

`a_n = a_1 (r^(n-1))`

You are given initial value of 4.
a1 = 4

The rate of growth is it doubles every generation or multiplies by 2.
r = 2

Answer:

`a_n = 4 (2^(n-1))`