PLS HELP<3ty this is due today! so please helppp tysmmm and have a great night or morning! :) (spam)

Which value of c would make he following expression completely factored? 8x+cy

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?

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x