A First Course in Differential Equations with Modeling Applications, 11/e (IE-Paperback)

Customary System of units (also referred to as English or imperial units) to Metric units.And it includes conversion tables to reference as you work throught the related applications and exercises. 
This book strikes a balance between the analytical, qualitative, and quantitative approaches to the study of differential equations. This proven text speaks to students of varied majors through a wealth of pedagogical aids, including an abundance of examples, explanations, "Remarks" boxes, and definitions. Written in a straightforward, readable, and helpful style, the book provides a thorough overview of the topics typically taught in a first course in differential equations.ns.