Find the area of these figures

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?

What is the missing step in this proof ?

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex