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A speculator bought stock at 25% below par and sold it at 20% above par. He gained $1560. How much did he invest?

A novel about Pythagoras and his followers

A collection of images of historical texts and tools to share with your students

A survey of the mathematics education of cadets in the first century after the founding of the U.S. Military Academy.

In a circle whose circumference is 60 units, a chord is drawn forming a segment whose sagitta is 2 units. What is the length of the chord?

A square walled city of unknown dimensions has four gates, one at the center of each side.

A two door gate of unknown width is opened so that a 2 inch gap exists between the two doors.

A collection of sixteen posters of contributors to calculus, with brief biographical sketches.

If 80 dollars worth of provisions will serve 20 men for 25 days, what number of men will the same amount of provisions serve for 10 days?