I am having a fair bit of trouble with combinations of functions.

First, I'd just like confirmation on whether or not I done a more basic question correctly.

1.) If ,and determine the following:

b.)

So

Is this correct?

For the next question I am given the following:

I don't know how I am supposed to use the graph to evaluate each expression here. Also, is the expression for a.) the same thing as ?

Lastly I am asked:

If and , find such that .

I have no idea how to solve this one.