Answer:
11. [tex]\tt{15-\frac{2}{12}=15-\frac{1}{6}=15(\frac{6}{6})-\frac{1}{6}=\frac{90}{6}-\frac{1}{6}}=\boxed{\boldsymbol{\frac{89}{6}\:\:or\:\:14\frac{5}{6}}}[/tex]
12. [tex]\tt{4-\frac{3}{5}=4(\frac{5}{5})-\frac{3}{5}=\frac{20}{5}-\frac{3}{5}}=\boxed{\boldsymbol{\frac{17}{5}\:\:or\:\:3\frac{2}{5}}}[/tex]
13. [tex]\tt{8-\frac{2}{7}=8(\frac{7}{7})-\frac{2}{7}=\frac{56}{7}-\frac{2}{7}}=\boxed{\boldsymbol{\frac{54}{7}\:\:or\:\:7\frac{5}{7}}}[/tex]
14. [tex]\tt{11-\frac{2}{9}=11(\frac{9}{9})-\frac{2}{9}=\frac{99}{9}-\frac{2}{9}}=\boxed{\boldsymbol{\frac{97}{9}\:\:or\:\:10\frac{7}{9}}}[/tex]
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