Use a system of inequalities to represent the situations described in Exercises 61 – 68, then solve the system using the methods developed in this section. In drawing the graph of your solution set, you may want to take into consideration that certain quantities cannot be negative and therefore you may want to restrict the solution set appropriately as we did in Example 9.
Diet. As part of her preparation for the World Cup in women’s soccer, Cassandra is taking several nutritional supplements. Quantum contains 4 mg of niacin and 80 mg of calcium. Nutraplus contains 2 mg of niacin and 220 mg of calcium. She wants to supplement her diet by taking at least 12 mg of niacin and 960 mg of calcium.
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