The purpose of the quantitative explanatory study was to investigate the relationship between student mathematics course prerequisite completion and the final grades attained in the required community college mathematics classes. A quantitative method was appropriate because it explored the relationship between the response variable, the final grade obtained in a required mathematics course, and the explanatory variables, ACT, SAT, COMPASS scores, and completion of the mathematics course prerequisite at a community college in the Northwest. Using Logistic Multiple Regression, Spearman Correlation Coefficient, and the "F" test, the study results indicated that the COMPASS score, ACT score, and meeting course prerequisites were significant indicators for determining success in an introductory mathematics course. The study results support the need for college administrators, teachers, and advisors to enforce course prerequisite requirements for introductory mathematics courses to promote student success. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]