First, do 40 - 12 = 28 (Subtract the change), then do 28 / 7 to get 4, so then we do the cans times 3 to see how many individual balls he has, which would be 12
X equals 31 in the equation
A.) because for Me you go right 3 and down 3 and so A.) you would go right 3 (5+3) which is 8 then down 3 which is 1.