Answer:
The answer is B
Step-by-step explanation:
A because that is where they cross
The domain of a function is where we have a value for x.
Since that's the case the domain of f(x) = {x e R / 1 ≤ x < 5}
We see that we have a value for x = 1 cuz we have a filled circle, but we don't have a value for x = 5, look at the unfilled circle
So, our x can vary between 1 and 5, but can't be 5.
F(x)=x-5
f(4)=x-5
f(4)=4-5
f(4)=-1
