Question

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Answer 1

9. The rational number that is equal to its negative is zero (0)

10. $\sf \dfrac{1}{3} ( 6 \ * \ \dfrac{4}{3} )$ can be written as $\sf ( \dfrac{1}{3} *6)*\dfrac{4}{3}$   using associate property.

associative property is when numbers are changed within the parenthesis with out the change in result.

formula of associative property : a(bc) = (ab)c

Answer 2

The answer is zero

Hopes this helps :)