# Math Insight

### Applet: Heating cost as a function of temperature and insulation

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We could imagine that this is the graph of a function $h(T,I)$ that gives heating cost as a function of outside temperature $T$ and amount of insulation $I$.

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#### General information about three.js applets

The applet was made using three.js and requires Javascript as well as a browser that supports WebGL. For most three.js applets, you can drag with the mouse to rotate the view, drag with the right button to pan, and zoom in/out with the mouse wheel. Many applets contain points that you can drag to change values of variables.