I need help with the following questions. Please show your work.

1) Find the inverse of f(x)=3 sqrt x-1/2

2) Let f(x)-2/2x-1
Show that this function is one-to-one algebraically.

3) Determine whether f(x)=3x-5 and g(x)=x/3+5 are inverses. Explain how you know.

please help