This document is designed to assist teachers by providing practical examples of real world applications of high school mathematics. Fifteen problems are presented that individuals in industry and business solve using mathematics. Each problem provides the contributor's name, suggested skills required to solve the problem, background information for solving the problem, ideas to consider in the problem-solving process, and the solution. The problem topics include: (1) straightening steel rods shipped to customers in coils; (2) laying out the horizontal alignment of a highway; (3) calculating the dimensions of unusually shaped windows; (4) calculating parking capacities on city street; (5) transmitting telephone calls; (6) adjusting a parabolic satellite antenna; (7) calculating the materials required to construct a highway; (8) calculating the forces on a bridge; (9) mounting a gas heater for optimal efficiency; (10) maximizing the efficiency of a telephone network; (11) forecasting energy needs of electrical utilities; (12) calculating the terminal velocity of a metal sphere; (13) ensuring adequate visibility at a railway crossing; (14) analyzing spot speed data to determine highway speed limits; and (15) calculating minimum area requirements that metal plates must cover in the construction of wooden trusses. (MDH)