Help me please I need to pass

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?

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Ineed to know the answer to this algebra question.