The 1920s were both a "roaring" and a turbulent decade for the United States. A thriving interest in all things modern--technology, jazz, social mores--clashed with a cultural backlash against growing multiculturalism and changing values.
A time of affluence. A time of fear. During Eisenhower's eight years in office, the United States fought a war in Korea, fretted about communism in Hollywood, and began a space program.
Stagflation, Watergate, the Iran Hostage Crisis -- the 1970s were tough years for the United States.
The presidency of Ronald Reagan issued in a more conservative era in the United States.
Learn about the presidency of Bill Clinton and the acceleration of globalization.
2003 AIME II Problem 1
perfect squares integers square root
A little trigonometry to figure out the area of a triangle
Minimum members in a committee
Probability of moving to a vertex
2003 AIME II Problem 3
Volume of a wedge cut from a cylindrical log
2003 AIME II Problem 5 Minor Correction
This video is from the Khan Academy subject of Math on the topic of Geometry and it covers 2003 AIME II Problem 7.
Sum of polynomial evaluated at roots of another polynomial
This video is from the Khan Academy subject of Math on the topic of Test prep and it covers 2010 IIT JEE Paper 1 Problem 50 Hyperbola Eccentricity.
Overview of cycles of regulation, de-regulation and government in 20th century US capitalism
Using Green's Theorem to establish a two dimensional version of the Divergence Theorem
This video is from the Khan Academy subject of Math on the topic of Arithmetic and pre-algebra and it covers 2 digit times 1 digit example (no carrying).
An example of conservation of momentum in two dimensions.