Answer
a) 2
b) 32, 64, 128
Work Step by Step
a) 2 is the common ratio because each number is being multiplied by 2. This resulting number is then multiplied by 2 and so on. 2 x 2 = 4, 4 x 2 = 8, 8 x 2 = 16. In this way, 2 is the common ratio.
b) The next three numbers in the sequence follow the same pattern of being multiplied by 2. Take the last number in the sequence (16) and multiply by 2:
16 x 2 = 32
32 x 2 = 64
64 x 2 = 128
