Problems from Another Time

A man agreed to pay for 13 valuable houses worth $5000 each, what the last would amount to, reckoning 7 cents for the first, 4 times 7 cents for the second, and so on, increasing the price 4 times on each to the last.

Discussion of 15th century French manuscript, with translation of its problems, including one with negative solutions

Curve sketching, tangent lines, and optimization, explored via interactive applets

A general formed his men into a square, that is, an equal number in rank and file, and he found that he had an excess of 59 men.