Since x is never less than -4 but is equal to it at one point and is less than 0 in some points, the only possible answer and the correct answer is x ≥ -4.
So the domain to this graph is x ≥ -4.
I believe the max would be 195ml. Hope this helps :)
Add 9 to both sides
So
33=2x
Divide both sides by 2
So
X=16.5
so x=5
substituting for x in the equation we get:

Ans C: 16