I could use some help

Pls will give brainliest and all p.s u can zoom in if u cant see plss

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?

Whats the name of the vertical axis