Acompany wishes to manufacture some boxes out of card. the boxes will have 6 sides (i. e. covered at the top). they wish the boxes to have a volume of 200 cm^3. what dimensions should they make the boxes in order to minimise the amount of card used? you can connect the sides of the box. you should marks they are assume no flaps are required to use the hessian matrix to prove this is indeed a minimum. [10