B. Check Up

B.  Check Up

Simplify the following expressions.

1. $(3a^{-2}{b}^{-4}{)}^{-2}$
   
   
   
   

2. $\frac{(4x^{-2}{y}^{-5}{)}^{-2}}{3xy}$
   
   
   
   

3. ${\left(\frac{2a^{10}{b}^{-4}}{8a^5}\right)}^{-2}$
   
   
   
   

4. ${\left(\frac{2a^3{b}^{-2}}{3a^2{b}^{-1}}\right)}^{-3}$

 

 

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