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Latest articles

Double springs interactive graph

revised double springs applet
The revised double spring applet now allows exploration on mobile devices. Here is some background... more »

Frequency of notes on a piano - interactive learning object

piano and combined signal
Explore piano note frequencies in this interactive learning object, combining trig graphs and exponential growth... more »

New applet: What does b do in a quadratic function?

Value of b in a quadratic function
y = ax2 + bx + c is a parabola. Changing the variables a and c are fairly simple, but what does b actually change, and by how much?.. more »

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