Last year, the seventh - grade enrollment at main middle school was 612 students. this year ,the enrollment dropped to 489 students due to the opening of a new middle school . which best reflects the percent change in enrollment at main middle school from last year to this year?

Asap 25 pts + brainliest to right/best answer

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

Ian is in training for a national hot dog eating contest on the 4th of july. on his first day of training, he eats 4 hot dogs. each day, he plans to eat 110% of the number of hot dogs he ate the previous day. write an explicit formula that could be used to find the number of hot dogs ian will eat on any particular day.