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.
The 1960s might be the most tumultuous decade in American history, when simmering resentments boiled over into rage against the status quo. From the assassination of John F. Kennedy to the My Lai Massacre, after the bloody Sixties the United States would never be the same.
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
Trigonometry and geometry to find the area of an equilateral (but not regular) hexagon
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 Mathlete training and it covers 2003 AIME II Problem 6.
This video is from the Khan Academy subject of Math on the topic of Geometry and it covers 2003 AIME II Problem 7.
Sequence from the product of 2 arithmetic sequences
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.