I need help plz help

The amount of energy it takes to lift a box might be a function of which of the following

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?

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n