Prerequisites - P.2 - Exponents and Radicals - Exercises - Page 25: 62

$a]$ $\frac{1}{1000}$ $b]$ $\frac{2}{3}$

$a]$ $100^{\frac{-3}{2}}=$ $(10^{2})^\frac{-3}{2}=$ $10^{-3}=$ $\frac{1}{1000}$ $b]$ $(\frac{9}{4})^{\frac{-1}{2}}=$ $(\frac{3}{2})^\frac{2\times-1}{2}= $ $(\frac{3}{2})^{-1}=$ $\frac{2}{3}$