Please need help asap

Write a polynomial for a third-degree polynomial with leading coefficient -4

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?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?