As awkward as it is; I have no idea how to answer question 2.. LOL
Anyway: question 1 is a dodgy q: I'd probably explain specific powers and residual powers as well as the limitations on state+commonwealth powers.
Question 3; House of review = checking legislation as it passes from the lower house before royal assent comes into play
states house = there's equal representation for each state regardless of size: hence each state's interests is represented fairly in the senate.
They do not apply as much today as if there is a majority government in the upper house it acts as a rubber stamp - passing and agreeing on legislation if there's a majority without reviewing legislation properly, and if there is a minority government they tend to over-scrutinise legislation, hence preventing laws from being passed well
soz if this is brief, you should expand on it
