Can someone help me out here?

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.

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

The graph of y x3 is translated so that the point (1. 1) is moved to (1, 4). what is the equation of the new graph?