What are the two solutions of cos(x/2)=-2/2

Np4=12np2 with clear explanation.

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?

Bradley hikes 12 miles in 3 hours. in relation to bradley’s hike, which statement describes the expression