Please Help 11th Grade Math ASAP
It is really hard so I need someone really smart.

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?

Rosy waxes 2/3 of her car with 1/4 bottle of car wax. at this rate, what fraction of the bottle of car wax will rosey use to wax her entire car

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)