Simplify the expressions. Enter your answers in exponential form. a. \( \frac{(-3 z)^{7}}{(-3 z)^{9}}=\square \) b. \( \frac{-3}{(-3)^{2}}=\square \) c. \( \frac{(\sqrt{5} t)^{8}}{(\sqrt{5} t)^{10}}=\square \)

(b) \( \frac{3}{x-1}<\frac{2}{x} \)

Diketahui sistem persamaan tinier berikut ini : \[ \begin{array}{l}-1 x+y+2 z=2 \\ 3 x-1 y+z=6 \\ -1 x+3 y+4 z=4\end{array} \] Tentukan solusi persamaan linear tersebut menggunakan metode gauss!

a. \( \frac{2 x^{3}+6 x-6}{x^{3}-1} \)

1) \( \frac{10 x+8}{3 a-b}-\frac{9 x+5}{3 a-b}= \)

Roger was told to think of a number, add 20 , then divide the result by 3 . The answer was Jower than Roger's original number. Deteruine the range of possible numbers Roger may have originally chosen.