My Limit..!

1. Finding a right and left end behavior model for a given function.
I understand it a few times but I need more clarification.

Ex.) f(x)=x+lnx

I know that you need to know how each graph looks like but from there, I get stuck.

2. Questions that involve finding the discontinuity.
I get stuck when it comes to questions like this because I don't know what to do.
Empty dot and fill-in dots throw me off.
Sometimes the questions that use piecewise confuse me.
For example, on Pg. 95, question 29.
I don't know why when x=0 and x=1 it is discontinuous.

3. Finding the horizontal asymptotes.
I sometimes know what they are because I already know how the graph looks like (e.g. f(x)= 1/x).
But I don't know what to do when given a more complex fucntion.
I rememeber one question I had trouble with was the last Free Response on our last test.
I forgot the function but I remember I couldn't find the horinzontal asymptotes.