Use the given graph of the function on the interval $[0,8]$ to answer the following questions.

1. For what values of $x$ does the function $f$ have a local maximum on $(0,8)$?
Answer (separate by commas): $x =$

2. For what values of $x$ does the function $f$ have a local minimum on $(0,8)$?
Answer (separate by commas): $x =$

3. Find the absolute maximum for the function $f$ on the interval $[0,8]$.
4. Find the absolute minimum for the function $f$ on the interval $[0,8]$.