Riddles, brain puzzles and mathematical problems

[Froge]

Spoiler below!

(2 + 2)! = 24
3^3 - 3 = 24
4*4 + 4 + 4 = 24
((5 - 5) * 5 + 5)! / 5 = 24
6 - 6 + 6 + 6 + 6 + 6 = 24

will update post as i find moar