Now there is a wall 5 feet thick and two rats tunnel from opposite sides.

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Now there is a wall 5 feet thick and two rats tunnel from opposite sides.

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.

Page 10: Courant through D'Ambrosio

This is the title page of the Siderius Nuncius (Starry Messenger) of Galileo (1564-1642), published in 1610. This book was a report on Galileo's first investigations with a telescope. Also includes Galileo's initial sketches of the surface of the moon.

Suppose the area of an equilateral triangle be 600. The sides are required.

A set of four posters dealing with the Pythagorean Theorem, infinity, prime numbers, and the history of pi.

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

A biography of the geometer Donald Coxeter.

A reprint of the 32nd yearbook of the NCTM, dealing with developments in mathematics education in the U.S. and Canada. In particular, it gives a history of the various reform movements up to the publication date of 1980.

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?