Consider the function $$f(x) = x^{3}-18x^{2}+81x+12.$$

1.	$f$ is increasing on the intervals
2.	$f$ is decreasing on the intervals
3.	The relative maxima of $f$ occur at $x$ =
4.	The relative minima of $f$ occur at $x$ =

Notes: In the last two, your answer should be a comma separated list of $x$ values or the word "none".