We can see that g(f(5)) = 0.
Let's find g(f(5)).
To find g(f(5)) first we need to find f(5). In the graph we can see that the line intercepts the x-axis when x = 5, so:
f(5) = 0
Then:
g(f(5)) = g(0)
Now let's look at the graph of g(x), it intercepts the x-axis when x = 0, so again:
g(0) =0
From this we conclude that:
g(f(5)) = 0