Do you know what shape this function has? I know that would help me find the range.

Spoiler:

The inverse is correct, you need to restrict the domain of your function so it is 1 to 1.

I agree with a)

for b) I think

c) Both functions are 1 to 1. Vertical line test is always a winner! Easier way is to learn the shape of these functions.

Can you finish it from here?

Can you finish it from here?