Geometry Help (Basic Explanations PLZ)

Hi there people. my first time posting.. and this really is my last resort.Maths teacher at school thinks we know everything.. leaving out basic explanations of words..

Help would be greatly apreciated as soon as possible..work due next day.. Ive got so many questions ill rather as for 1 thing and get some marks.. YAY..

Anyway

Please could someone explain what Domain and Range is.. Very basic plz!

Then could you answer what Domain and Ranges are in these four examples..

1.f(x)=(x+1)squared -4 its all functions.. Thanks allot if you can help

2.g(x)=-(x+1) "" -2

3.h(x)=-(x-1) "" +4

4.j(x)=(x-4) "" -2

4.

I really sturggle in my Maths.. Failed this term 24% (Crying)