(20 points) I already did the first 3 can someone finish the rest? Thank you so much!;-)

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

Candice uses the function f(t)=t+100−−−−−−√ to model the number of students in her after-school program. the variable t represents days and f(t) represents the number of students. how many days does it take for there to be 15 students in her program? a. 225 days b. 125 days c. 325 days d. 115 days