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The functions that model the process of the elimination of alcohol from the body serve as an introduction to a study of rational functions at an intermediate algebra level.
This investigation of the genetics of the Sickle Cell trait via a mathematical model uses probability and teaches properties of quadratic functions and the concept of optimization of a function.
The purpose of this lesson is to develop an understanding of quadratic functions.

Studies $y=k/x$ and the meaning of asymptote. Uses fact that elimination rate for some drugs varies by population.

Outstanding multipurpose tool for demonstrating vector fields, flows, equipotential surfaces, divergence, curl, and both Stokes' Theorem and the Divergence Theorem.
The Java applet provides graphical solutions of ordinary differential equations using a fourth-order Runge-Kutta method with constant step size.
This applet calculates symbolically the inverse Laplace Transform of quotients of polynomials with real-valued coefficients. The resulting inverse transform is then plotted.
These are lab projects for a differential equations course. Within each lab there are one or more Java applets that will help with the lab project and are valuable by themselves.
"So Much Coffee, So Little Time" can be used at the Intermediate Algebra level to help students see the value of "solving systems of linear equations".