Hi, help pls and thank you

What are the domain and range of the function? f(x) = -4 (sqrt)x

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out