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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 Sequence Alignment Category. These two worksheets implement a dynamic programming algorithm for pairwise sequence alignment.

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.

Users toss a virtual coin or die to investigate the law of averages. The outcomes of multiple experiments (consisting of 10000 tosses each) can be graphed on the same plot to facilitate visualization of trends. An activity is provided to facilitate thinking about the law of averages with the applet.

A collection of GeoGebra applets and activities for exploring the properties of reflections, rotations, translations and glide reflections in the plane.
This Biological ESTEEM module in the Botany Category allows scientists to collect data from specimens, insert the measurements into a spatially explicit L-system package, and visually compare to the computer generated 3D image with such specimens.
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.
This applet and corresponding activity represent a general demonstration of the effects of the Central Limit Theorem. 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