Question

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Answer 1

i hope this will help you

Answer 2

$a + b \\ = \frac{2}{7} + \frac{ - 9}{5} \\ = \frac{10 - 63}{35} \\ = \frac{ - 53}{35} \\ b + a \\ = \frac{ - 9}{5} + \frac{2}{7} \\ = \frac{ - 63 + 10}{35} \\ = \frac{ - 53}{35}$
So the first part is verified.
$a \times b \\ = \frac{2}{7} \times \frac{ - 9}{5} \\ = \frac{ - 18}{35} \\ b \times a \\ = \frac{ - 9}{5} \times \frac{2}{7} \\ = \frac{ - 18}{35}$
So the second part is verified too.