What is the degree of 12x^4-8x+4x^2-3

Answer question above and explain each step : )

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?

Which of the following is correct interpretation of the expression -4+13