I'm a bit confused, if
So why is the natural log always shown as and not
As MF said you can take the natural log of any pronumeral you wish.
In most textbooks I have seen, a lot of the questions are in the form , this means y is equal to a function of x. A lot of natural log questions therefore are along the lines of .
This will be the reason that the majority of questions you have seen are , not .