¿Cómo se relaciona la dependencia funcional entre una variable y una incógnita? ¿Cuándo y por qué son diferentes?

15 point ! ~ see if you know the answer to both you!

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?

1.)solve for z. -52=-4z 2.)solve for p 9/2.3=9.2 3.)solve for y. -1.17y=5.85 4.)solve for x. 3x/8=6