Ican’t understand what’s asking me to do

Answer this question only if you know the 30 points and

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?

Select the lengths in centimeters that would form a right triangle