Pls Help me:) Brailiest!

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?

Which of the following is correct interpretation of the expression -4+13

Define multiplicative inverse. give an example of a number and its multiplicative inverse.