Can someone please help me please and thank you

I need it ASAP

Which matrix multiplication is possible?

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

How much is $1200 worth at the end of1 year,if the interest rate is 5.5% is compounded quarterly.