tolong kaaa besok dikumpulkan Dengan caranya

NO 7
[tex] {3}^{n} = 81 \\ {3}^{n} = {3}^{4} \\ maka \: n = 4[/tex]
NO 6
[tex]4 \times \frac{1}{2} \div \frac{3}{5} \\ = \frac{9}{2} \div \frac{3}{5} \\ = \frac{9}{2} \times \frac{5}{3} \\ = \frac{45}{6} \\ = \frac{15}{2} [/tex]