Find the value F1,F2 and E2

If ac = 12 and ab=7 is it possible that bc =10

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?

2.5 milligrams is equivalent to how many grams