Pls help me asap for brainlest

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?

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

If a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs