This is similar to Problem 7 from your 1.3 worksheet.

Rewrite the following expressions into expressions that only involve positive exponents.

a) $x^{-9}=$

b) $\dfrac{1}{x^{-8}}=$

c) $\left(\dfrac{1}{x}\right)^{-9}=$

d) $\left(\dfrac{x}{y}\right)^{-3}=$