Square roots? Can anyone Help?

Answer these they are hints for your questions. 

4*4*4=(4)³=

2*2*2*2=2⁴=

3*3*3*3=3⁴=

I'm not sure what this one means 

4 sqrt x20y28

$$4\sqrt{x} \times20\times y^{28}$$      perhaps?

$$\frac{\sqrt{64}}{\sqrt{169}}=\frac{8}{13}$$

You can not find the square root of a negative number.

sqrt(10000/81)=sqrt(10000)/sqrt(81)=100/9=11 and 1/9

Okay! THanks Melody! What about the other 4?

So the third one is 1/9?

No, for that last one you were confused about, its supposed to be like:

4√ x20y28

Still not sure how to do the ones you gave hints for :(