This is a collection of articles dealing with mathematical applications for use by high school teachers and students. The articles are intended to illustrate several themes: (1) how mathematics is applied via construction of mathematical models; (2) the various types of activities in applied mathematics; (3) the role of pure mathematics in applied mathematics; and (4) a number of specific examples illustrating the nature of applications of mathematics in a variety of fields. Chapter topics include: (1) mathematics and social policy; (2) mathematics in the natural sciences; (3) computers; (4) elections; (5) geometry; (6) orbiting; (7) crytography; (8) nuclear energy; (9) space age; (10) capital budgeting; (11) decision models; (12) social sciences; (13) psychology; (14) chemistry; (15) neural networks; (16) queueing; (17) the birthday problem; and (18) bridge. (MP)