[tex]a) \: \sqrt{0} = \sqrt{ {0}^{2} } = 0 \\ \sqrt{1} = \sqrt{ {1}^{2} } = 1 \\ \sqrt{4} = \sqrt{ {2}^{2} } = 2 \\ \sqrt{25} = \sqrt{ {5}^{2} } = 5 \\ \sqrt{9} = \sqrt{ {3}^{2} } = 3 \\ \sqrt{100} = \sqrt{ {10}^{2} } = 10 \\ \sqrt{400} = \sqrt{ {20}^{2} } = 20 \\ \sqrt{121} = \sqrt{ {11}^{2} } = 11[/tex]
[tex]b) \: \sqrt{ \frac{1}{4} } = \sqrt{ {( \frac{1}{2} )}^{2} } = \frac{1}{2} \\ \sqrt{1 \frac{11}{25} } = \sqrt{ \frac{36}{25} } = \sqrt{ {( \frac{6}{5}) }^{2} } = \frac{6}{5} = 1 \frac{1}{5} \\ \sqrt{ \frac{16}{49} } = \sqrt{ {( \frac{4}{7}) }^{2} } = \frac{4}{7} \\ \sqrt{ \frac{81}{196} } = \sqrt{ {( \frac{9}{14} )}^{2} } = \frac{9}{14} \\ \sqrt{0.0001} = \sqrt{ \frac{1}{10000} } = \sqrt{ {( \frac{1}{100} )}^{2} } = \frac{1}{100} \\ \sqrt{6.25} = \sqrt{ \frac{625}{100} } = \sqrt{ {( \frac{25}{10} )}^{2} } = \frac{25}{10} = \frac{5}{2} = 2 \frac{1}{2} [/tex]
