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These applets provide interactive student activities to make connections between the graphical and analytical interpretation of "completing the square" and writing the equation of a parabola in general and standard form.
A Biological ESTEEM module in the Epidemiology Category. This worksheet implements an SIR (Susceptible/ Infected/ Resistant) model of epidemiology for vector-borne diseases.

A mathlet that illustrates the relationship between the graphs of the natural sine and cosine curves and the vertical and horizontal coordinates of points on the unit circle.

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Geometry Playground (v1.3) is a free Java application for doing "ruler and compass" constructions in both Euclidean, Spherical, Projective, Hyperbolic, Toroidal, Manhattan and Conical geometries. Its purpose is to help users develop a familiarity with various conceptualizations of these geometries.

This ESTEEM module in the Biometrics Category describes construction of three simple databases using a spreadsheet. Recommendations for building simple databases using a computer spreadsheet and the statistical analysis of its data are given.
Announcing completion of the transition from the "old" site at Math Forum to the "new" site at MAA
This mathlet includes several puzzles for students to play with the derivative.
These applets and educational materials demonstrate the shapes and parameters for several commonly used discrete and continuous probability distributions. It is part of the Statistics Online Computational Resource (SOCR).
A module intended to introduce the use of mathematical models in population dynamics from a biological perspective and to give substance to an elementary differential equations course