Which system of equations shows a solution of (0.5, -1)?
Need answers asap plzzz

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 value of x when x + 7 = 21?

Which of the following is the result of expanding the series