Can someone help me with this please and maybe explain it to me if u can. But please don’t come for just points:)

Which matrix multiplication is possible?

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?

You can find the constant of proportionality by finding the ratio of