I'm going to show you how to get the inverse function with example a). The remaining examples have to be done similarly.

to #a):

From you'll get the equation of the function f:

To find the equation of the inverse function you have to swap the variables and solve this equation for y:

(Remark: You'll get the graph of by reflection of the graph of f at the line y = x)

... and now it's your turn!