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This mathlet computes the center of mass (centroid) of a lamina of uniform density.
This article describes classes for 3D graphing revised for AS 3. Along with class files and documentation, we provide several templates to show how to use the classes for graphs of functions of two variables as well as parametrically defined surfaces.
This applet explores the relationship between the cross-sectional area of a gutter (bent from a fixed-width sheet of metal) and the height of the gutter. Supporting material is given for topics ranging from quadratic modeling to max/min problems.
An article about using Excel to illustrate two concepts associated with attribute acceptance sampling plans: Calculating the probability of lot acceptance, and designing a plan that satisfies certain consumer's and producer's risks.
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Excel Simulations and Tools for Exploratory, Experiential Mathematics (ESTEEM) is a project of the members of the BioQuest Curriculum Consortium.

This article describes an authoring tool that translates a simple, TeX-like input syntax into Content MathML. The MathML can then be copied and pasted into web pages.

A module to study turns at high speed, where frictional effects are not sufficient to maintain circular motion

Three applets allow you to interact with the puzzle described in the April 2009 Mathematics Magazine article by Alex Fink and Richard Guy.
A Biological ESTEEM module from the Ecology Category. This Excel workbook demonstrates the principles of the MacArthur-Wilson theory of Island Biogeography.