Assume that producing 1 unit of calcium requires 0.1 units of calcium, 0 units of hydrogen, and 0 units of sea salt; that producing 1 unit of hydrogen requires 0.2 units of calcium, 0.1 units of hydrogen, and 0.1 units of sea salt; and that producing 1 unit of sea salt requires 0.4 units of calcium, 0.1 units of hydrogen, and 0.2 units of sea salt. Find the production schedule that satisfies an external demand for 43 units of calcium, 28 units of hydrogen, and 12 units of sea salt. X =

Consider three connected lakes, A, B, and C, where lake B has a volume of 2650 km3, and water flows from lake A into lake B, and from lake B into lake C, both inflows and outflows at the same rate of 525 km3/year. Suppose that at time t=0 (years), the pollutant concentration of lake B, caused by past industrial pollution that has now been ordered to cease, is five times that of lake A. If the outflow from lake B to lake C is perfectly mixed lake water, how long will it take to reduce the pollution concentration in lake B to twice that of lake A? Choose all correct answers. B Approximately 6.3 years. Approximately 4.4 years. Approximately 5 years. Approximately 8.3 years. Approximately 7 years.

8.      Suppose that a bacteria population doubles every eleven hours.  If the initial population is 2,000 individuals, approximately how many hours would it take the population to reach 20,000?

A company is producing 3 products A ,B and C. BOM of each product is given in the table below. Material Unit Product A Product B Product C Steel Ton 4 Aluminum KG 50 40 60 Wood CFT 10 10 Glass SFT 30 30 Rubber Sealer RFT 100 120 Screws Рack 5 6 4 Nut Bolt Dozen 2 Calculate the material requirements for 6 months production for all the products if monthly demand for A=1000, B=1200 and C=1500 units