Use the given graph of the function $f$ to find the following limits:

1. $\displaystyle \lim_{x \to 1^{-}}f(x) =$ help (limits)

2. $\displaystyle \lim_{x \to 1^{+}}f(x) =$

3. $\displaystyle \lim_{x \to 1}f(x) =$

4. $\displaystyle \lim_{x \to 4}f(x) =$

5. $\displaystyle f(4) =$

Note: You can click on the graph to enlarge the image.
Note: If a limit does not exist, enter DNE.