9 fish (:
5/6 of 54 is 45, so you would need to subtract 45 from 54, which is 9.
I hope you find this useful, and, if so, please mark as brainliest :P
Good luck!
Answer:

Step-by-step explanation:
Since f(x) and g(x) share the same top at (0,0), their difference is only a scale factor, so g(x) = ax² but we need to find a.
To find it, we use the given point of g, (2,1)
So g(2) = 1
meaning that
a·2² = 1
4a = 1
a = 1/4