Given the piecewise function shown below, select all of the following statements that are true

What is the product of the radical expression. (7-2square root) (8+2 square root)

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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?