Question

please help please help​

Answer 1

Step-by-step explanation:

$(9) \\ = > \frac{ - 8}{9} \div \frac{ - 4}{3} = \frac{ - 8}{9} \times \frac{3}{ - 4} = \frac{2}{3}$

$(10) \\ = > {3}^{ - 12}$

$(12) \\ = > { (\frac{4}{5} )}^{ - 3} \times { (\frac{4}{5}) }^{ - 2} = {( \frac{4}{5} )}^{5x} \\ = > { (\frac{4}{5}) }^{ - 5} = { (\frac{4}{5} )}^{5x} \\ = > - 5 = 5x \\ = > x = - 1$