The emphasis is on so-called "best solution" problems to questions that frequently arise in practical situations, such as finding an answer for the least amount of time, greatest volume, least amount of work, maximum profit, and minimum cost. One of this module's purposes is to help users become acquainted with the types of calculations necessary to solve such real-world problems. The material looks at: A) Minimum Cost Problem in Industry; B) A Maximum Profit Problem; C) Snell's Law-Light Refraction; D) Surface Area of a Bee's Cell, and E) Arterial Branching. Exercises and a model exam are included, with an answer key to both provided. (MP)