For when your solar-powered calculator isn't enough.

Here's a good way to double-check your work.

The moldy old history of matrices.

What is an augmented matrix, anyways? Find out here.

In case you've never seen what we're talking about.

A solid intro to matrices from a dude with a radio-announcer voice.

Go back to the old-fashioned pen-and-paper method.

They know math like it's no one's business.