Answer:
A - Domain - [0,9] , Range - [0,3] , It represents a function because it passes the (vertical line test).
B - (0,0)
C - I'm not sure about this question but, If i would guess, (0,0) (9,3).
Explanation:
For question C i think It means maximum and minimum points on the graph.
Im sorry if you get any of it wrong.