Pls help, it’s geometry

What is the square root of 45? (step by step working plz)

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)