Can someone pls help I’ll make brainiest pls it’s due today

F(x)= 1/x-4, g(x)=4x+1/x a. use composition to prove whether or not the functions are inverses of each other. b. express the domain of the compositions using interval notation.

What is the difference between the points (4, 7) and (4, -5)? a. 0 units b. 2 units c. 4 units d. 12 units

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?