Answer: 4
Explanation:
The notation g(0) means "the output g(x) when the input x = 0".
We're looking for the point that has x coordinate of 0.
That would be the point (0,4)
There's not much else to explain when it comes to showing your work.
Another example would be g(3) = -2 due to the point (3,-2)
Final example: g(6) = 8 because (6,8)