Adozen plain hats cost 3.60,what is the unit rate of a hat?

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?

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

What is the frequency of the sinusoidal graph?