Aside from the fact that im a complete retard when it comes to math my teacher is also horrendous....Any help with these problems would be much appreciated!..

if A=[3 6] [-1 5]

[1 2] and B= [4 3] then find A-2B

Find the matrix....[1 2] [4 1 1]

[-1 3] [1 2 3]

[1 1]