Decide whether the data in the table represent a linear function or an exponential function. Explain how you know.
x y
1 162
2 54
3 18
4 6
5 2
A. The data represent an exponential function because there is a common ratio of 3.
B.The data represent a linear function because there is a common difference of 108.
C. The data represent a linear function because there is a common difference of –108.
D. The data represent an exponential function because there is a common ratio of 1/3.