Tony has an order for a rectangular sheet of metal that measures 42m^2. If he already has a sheet that is 7 meters long and 2 meters wide, what size sheet will he need to weld to this sheet in order to complete the order?

In order to solve this problem, you need to subtract the metal sheet Tony already has (7m x 2m = 14m^2) from the total size he needs, which is 42m^2. So 42m-14m = 28m^2 that still need to be accounted for. Since it is a rectangular shape, one of the dimensions of the added sheet must be the same as the original. the only dimension would be 7m by 4m which would equal 28m^2. Add this to the original 14m^2 and this would add up to the desired 42m^2. So your answer is 7m by 4m sheet needs to be added.