This is easy -- it's just a list of steps. At this level, the problems are pretty simple.
Let's just do one, then I'll write out the list of steps for you.
Find the inverse of
STEP 1: Stick a "y" in for the "f(x)" guy:
STEP 2: Switch the x and y
( because every (x, y) has a (y, x) partner! ):
STEP 3: Solve for y:
STEP 4: Stick in the inverse notation,