Use the Pythagprean theorem:

We have:

Substitute:
1/4 x 16
= 16 ÷ 4
= 4
1/3 x 24
= 24 ÷ 3
= 8
8 is greater than 4, so one third of 24 is bigger than one fourth of 16
feel free to ask questions if you are still confused!
Y^2 + z^2 = x^2 (the third one)
From the graph given
For f(x), where x = 3, on the graph f(3) is

For g(x), where x = 3, on the graph g(3) is

Hence,

The answer is the second option