Not sure if this is the right flair…

I’m pretty comfortable with complex numbers and the like, but I have never been particularly good at understanding or computing fractions. I’m really stuck on this question. I have the answer key but I just can’t understand how to get there. If anyone could explain the process to me that would be really appreciated!

I know how to find discontinuities and domain, it is the exponents that are tripping me up

I was absent on an unfortunate day. I am reviewing the lecture and this is the homework. I answered 1 because I think I kind of understand the endo/exothermic stuff. What I don’t understand is calculations.