Answer:
Mostly correct
For Q3, you are doing great, you remembered that negative numbers can happen if the exponent is an odd number.
For Q4, I think you were confused with the fractions,
4(i)
![((2)/(3) )^(4) = ((2^(4))/(3^(4))) = ((16)/(81)) =0.198](https://img.qammunity.org/2021/formulas/mathematics/college/9iuk3ax12c0z9sj3kg8fbap0r2tw197zz7.png)
4(ii) is also wrong but I'll let you try to fix it yourself following what I given you for 4(i). You should get 1/64
Hope this helps!