Which equations have a unit range of 4.5

Plzzzzzzzzzzzzzzzzzzzzzzzzz will give brainliest

What number should be added to both sides of the equation to complete this square? x^2-10x=7

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?