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Why is 'x' Always the Unknown?

The Reason

Again, it's time for some math information you might have missed in school. (Don't you just love the clock?  It is probably for math geeks, but I wish I had one for my room at school.)

Today's question is: Why is "x" the symbol for an unknown?  In a short and funny four minute talk, Terry Moore gives the surprising answer. Just click under the clock to find out the reason!

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