Xis no more than b and no less than a" may translate to a less then or equal to x less then or equal b. true or false

Can any one me with the answers to these questions asap?

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?

Atown has a population of 17000 and grows at 2.5% every year. to the nearest year, how long will it be until the population will reach 19600?