This collection of materials includes six units dealing with applications of matrix methods. These are: 105-Food Service Management; 107-Markov Chains; 108-Electrical Circuits; 109-Food Service and Dietary Requirements; 111-Fixed Point and Absorbing Markov Chains; and 112-Analysis of Linear Circuits. The units contain exercises and model exams, with answers to at least some exercises and to all test questions. This document set also contains four sections on derivatives of trigonometric functions: 158-Challenge Problems; 159-Formulating Conjectures About the Derivatives; 160-Verifying Conjectures About the Derivatives; and model exams and answers to these test problems. The final module included is 162-Determining Constants of Integration. Exercises and problem solutions are included in this unit. (MP)