Does anyone know the answer for his ?

Use set builder notation to represent the following set: { -3, -2, -1, 0}

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?

Prove that 16^4-2^13-4^5 is divisible by 11.