The numbers $\displaystyle-\sqrt{{{81}}}\usepackage{cmbright}\Huge\$ , $\displaystyle\sqrt{{{2}}}\usepackage{cmbright}\Huge\$ , $\displaystyle{3.0}{\overline{{3}}}\usepackage{cmbright}\Huge\$ , and $\displaystyle\pi\usepackage{cmbright}\Huge\$ all belong to which of the following number sets?