A box contains 20 screws which are identical in size, but 12 of which are zinccoated and 8 of which are not. Two screws are selected at random, withoutreplacement. a. Find the probability that both are zinc coated. b. Find the probability that at least one is zinc coated.

Efficient homemakers ltd. makes canvas wallets and leather wallets as part of a money-making project. for the canvas wallets, they need two yards of canvas and two yards of leather. for the leather wallets, they need four yards of leather and three yards of canvas. their production unit has purchased 44 yards of leather and 40 yards of canvas. let x be the number of leather wallets and y be the number of canvas wallets. draw the graph showing the feasible region to represent the number of the leather and canvas wallets that can be produced.