Need help with a couple math problems.

Question

Thanks for the help in advance :)))

So basically im having some trouble, But i dont want to just know how to do it i want to know how its done if i got it wrong.. So i have a couple math problems here on some screenshots ill attach below. Please let me know the awnsers, and any ill check them with what i got and any i got wrong ill ask about and it would be amazing if you could help me out. Thanks!

 

--SCREENSHOTS--

http://imgur.com/a/yzeI0

Much luv from NC

EDIT: If you see any i clearly missed, If you could please even if short give me a explanation as to why that would be helpful..

Answer 1

FIRST one's answer is 5n²t³/2

 

5.  a⁰+b⁰ does indeed equal 1

 

3.  answer is 1/5

 

2.  answer is 1

 

6.  answer is 3y

 

w to -12 equqls 1/w¹²

 

(2m)^-1 = 1/(2m)