Answer: They are not equal expressions
Explanation:
2 to the 3rd power is 8 because 2x2x2= 8. 3z cannot equal 8 because lets say z equaled 2. Then 3z would be 6 which does not equal 8. If z equaled 3 then 3z would be 9. None of those answers are 8 therefore. They are not equivelent expressions.