a.
[tex](11 \frac{2}{7} + 5 \frac{5}{7} ) - \frac{1}{9} = ( \frac{11 \times 7 + 2}{7} + \frac{5 \times 7 + 5}{7} ) - \frac{1}{9} = ( \frac{79}{7} + \frac{40}{7}) = \frac{119}{7} - \frac{1}{9} = 17 - \frac{1}{9} = \frac{17 \times 9}{9} - \frac{1}{9} = \frac{153 - 1}{9} = \frac{152}{9} = 16.(8) [/tex]
b.
[tex]5 + \frac{2}{5} \times 3 + \frac{7}{10} \times 4 - \frac{4}{15} = 5 + \frac{6}{5} + \frac{28}{10} - \frac{4}{15} = 5 + \frac{18}{15} + \frac{14}{5} - \frac{4}{15} =5 + \frac{14}{15} + \frac{42}{15} = 5 + \frac{56}{15}
= \frac{75 + 56}{15} = \frac{131}{15} = 8.7(3)[/tex]
