You cannot evaluate for (g o f)(0). You will get an undefined answer.
(g o f)(x) tells you to plug in the f(x) function for the x-variable in the g(x) equation; so it would be like saying g(f(x)). This would result in (g o f)(x) = (1/x) - 4. Now plug in 0, (g o f)(0) = 1/0 - 4. One cannot divide by zero in order to simplify the equation and get an answer... unless an undefined answer counts, which I'm pretty sure it doesn't.
Answer:
(0,1) and (-2,4)
Step-by-step explanation:
Reflection over y axis means that the x axis coordinate will be negative as it will now have shifted to the other side of the axis. Since (0,1) is on the y axis it will remain in it's position not changing. (2,4) will change to (-2,4) as it is now at the other side (negative-x side) of the y axis. I hope I helped