[tex]a) = \frac{37}{30} + (0.8 - 2.13)[/tex]
[tex] = \frac{37}{30} + ( - 1.33)[/tex]
[tex] = \frac{37}{30} - 1.33[/tex]
[tex] = \frac{37}{30} - \frac{133}{100} [/tex]
[tex] = - \frac{29}{300} [/tex]
[tex]b) \frac{63}{20} + ( \frac{3}{7} - \frac{8}{15} )[/tex]
[tex] = \frac{63}{20} + ( - \frac{11}{105}) [/tex]
[tex] = \frac{63}{20} - \frac{11}{105} [/tex]
[tex] = \frac{1279}{420} [/tex]
