New York schools chancellor Joel Klein often speaks eloquently about the harm that the education system’s inability to dismiss incompetent teachers does to children. He’s right about that, of course.

For centuries, one of algebra’s oldest puzzles has remained unsolved—how to find exact answers for higher-degree polynomials, where the variable is raised to the fifth power or more. Mathematicians ...

Bob Moses became famous as one of the chief organizers of the Freedom Summer of 1964, when hundreds of college students invaded Mississippi to fight nonviolently for civil rights. But Moses was also a ...

Simultaneous equations Simultaneous examples with no common coefficients Creating and solving simultaneous equations Simultaneous equations with linear and quadratic Solving simultaneous equations ...