How do you determine sample size needed for a factorial design reddit?

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?

Determine domain and range, largest open interval, and intervals which function is continuous.

Determine the area of a triangle with (see picture below)