[tex]r) \ \sqrt{\frac{20}{180}} =\sqrt{\frac{1}{9}} = \frac{\sqrt{1}}{\sqrt{9}} = \frac{1}{3}\\\\\\s) \ \sqrt{1\frac{18}{32}} = \sqrt{1\frac{9}{16}} = \sqrt{\frac{25}{16}} = \frac{\sqrt{25}}{\sqrt{16}} = \frac{5}{4} = 1\frac{1}{4}\\\\\\t) \ \sqrt{2\frac{7}{28}} = \sqrt{2\frac{1}{4}} = \sqrt{\frac{9}{4}} = \frac{\sqrt{9}}{\sqrt{4}} = \frac{3}{2} = 1\frac{1}{2}[/tex]
[tex]u) \ \sqrt{1\frac{22}{50}} = \sqrt{1\frac{11}{25}} = \sqrt{\frac{36}{25}} = \frac{\sqrt{36}}{\sqrt{25}} = \frac{6}{5} = 1\frac{1}{5}[/tex]
