This module was developed for use in a first-semester differential calculus course to stimulate interest in the derivative as a tool for modeling rate of change, as well as belief that useful information can be gleaned from hypotheses about rates of change. This is typically not the student's first exposure to Euler's method. The new concepts here are first-order systems of differential equations and application of the same Euler idea to a system.
While the language is kept as simple as possible for calculus students, the module could also be used early in a differential equations course for students who have not seen these concepts in their calculus course.
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