Help me with this math problem

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?

Is a positive integer raised to a negative power always positive

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept