Answer
The next three terms are 16, 32, and 64.
Work Step by Step
1, 2, 4, 8,...
To get from 1 to 2, you multiply by 2.
To get from 2 to 4, you multiply by 2.
To get from 4 to 8, you multiply by 2.
Each term is double the term before it, so:
8*2=16
16*2=32
32*2=64