Alex is tracking how many computers he can fix in an afternoon. He listed the number of computers fixed per hour in the following table:


Hour (x) Number of Customers
f(x)
1 4
2 8
3 12


Determine if these data represent a linear function or an exponential function, and give the common difference or ratio.
This is an exponential function because there is a common ratio of 4.
This is a linear function because there is a common difference of 4.
This is a linear function because there is a common difference of 8.
This is an exponential function because there is a common ratio of 8.