$5^2=$  

(a)  

 $\left(-3\right)^2$ =

(a)  

 $-3^2=$  

(a)  

 $\sqrt{-9}=$  

(a)  

 $\sqrt{81}=$  

(a)  

 $8^2$  

(a)  

 $\frac{147}{7^2}=$  

(a)  

 $\frac{-10^2}{5}=$  

(a)  

 $\frac{204+8^2}{\left(-2\right)^2}=$  

(a)  

 $\frac{-5^2+\left(4\right)^2}{-3^2}=$  

(a)