I need Help on this plz!

Nutritional elements (units /1b) A B C Cost (cents/lb) Feed 1 3 7 3 10 Feed 2 2 2 6 4 Requirements 60 84 72 min 1037 + 4y subject to 3x + 23; 2 60 73 + 2y 2 84 3x + By 2 72 33,3120 5. Formulate the mathematical model and solve the problem. (a) A poultry producer's stock requires at least 124 units of nutritional element A and 60 units of nutritional element of B daily. Two feeds are available for use. One lb of Feed 1 costs 16 cents and contains 10 units of A and 3 units of B. One pound of Feed 2 costs 14 cents and contains 4 units of A and 5 units of B. Determine the least expensive adequate feeding diet. (b) For what range on the ratio of the costs of Feed 1 to Feed 2 would the optimal diet be the above diet? (0) For what range on the ratio of the costs of Feed 1 to Feed 2 would the optimal diet for the problem of part (a) not be unique? 6. Premium loam is 60% soil and 40% domestic manure and costs $5 per pound (lb). Generic loam is 20% soil and 10% domestic manure (and 70% other stuff) and costs $1 per pound (1b). We need loam for our backyard that is at least 36% soil and at least 20% domestic manure. What combination of the two loams should we use to minimize costs? (Note: loam is a fine soil composed of a mixture of sand, clay, silt and organic matter) 7. Formulate a mathematical model for this problem. Do NOT solve the problem. A coin is to be minted containing at least 40% silver and at least 50% copper. The mint has available Alloys A, B, C, D with the following compositions and costs. A B C D % Silver 30 35 50 40 % Copper 60 35 50 45 Cost/lb (3) 11 12 16 14 What blend of these alloys provides the required composition at minimal cost