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)

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!
Answer:
12
Step-by-step explanation:
2x - 7 =5 +x
2x - x =5 +7
x =12 (one solution)
Combined in mathematics is to add together to find a total. If you combine 1 and 2 you get 3.