The function is 
.
This means that as we get from 1 to 2, we have the following values:
, and 
.
Similarly, if we check x=3, we have
.
We can see that as x changes by 1 (with greater values), y increases by a factor of 12.
Answer: multiply by 12
This means that as we get from 1 to 2, we have the following values:
Similarly, if we check x=3, we have
We can see that as x changes by 1 (with greater values), y increases by a factor of 12.
Answer: multiply by 12
