The given graph of the DERIVATIVE $f'$ of a function $f$ is shown. Answer the following questions only on the interval $(-6,6)$.

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1. On what intervals is $f$ increasing?
Answer (in interval notation):

2. On what intervals is $f$ decreasing?
Answer (in interval notation):

3. At what values of $x$ does $f$ have a relative maximum?
Answer (separate by commas): $x =$

4. At what values of $x$ does $f$ have a relative minimum?
Answer (separate by commas): $x =$

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Note: You can click on the graph to enlarge the image.

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Hint: