Can anyone answer me this question

Question 1:

For this case we have the following functions:

We must find):

By definition we have to:

We substitute :

So, we have that

Question 2:

For this case we have the following functions:

We must find :

By definition we have to:

We substitute :

Question 3:

For this case we must find the inverse of the following function:

To do this, we follow the steps below:

We change y for :

We exchange variables:

We clear the value of the variable "y":

We change y for :