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  2. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    In general, if an increase of x percent is followed by a decrease of x percent, and the initial amount was p, the final amount is p (1 + 0.01 x)(1 − 0.01 x) = p (1 − (0.01 x) 2); hence the net change is an overall decrease by x percent of x percent (the square of the original percent change when expressed as a decimal number).

  3. Letter frequency - Wikipedia

    en.wikipedia.org/wiki/Letter_frequency

    The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...

  4. Albedo - Wikipedia

    en.wikipedia.org/wiki/Albedo

    When seen from a distance, the ocean surface has a low albedo, as do most forests, whereas desert areas have some of the highest albedos among landforms. Most land areas are in an albedo range of 0.1 to 0.4. [14] The average albedo of Earth is about 0.3. [15] This is far higher than for the ocean primarily because of the contribution of clouds.

  5. Intel 8087 - Wikipedia

    en.wikipedia.org/wiki/Intel_8087

    The 8087 did not implement the eventual IEEE 754 standard in all its details, as the standard was not finished until 1985, but the 80387 did. The 8087 provided two basic 32 / 64-bit floating-point data types and an additional extended 80-bit internal temporary format (that could also be stored in memory) to improve accuracy over large and ...

  6. College tuition in the United States - Wikipedia

    en.wikipedia.org/wiki/College_tuition_in_the...

    Tuition and fees do not include the cost of housing and food. For most students in the US, the cost of living away from home, whether in a dorm room or by renting an apartment, would exceed the cost of tuition and fees. [7] [9] In the 2023–2024 school year, living on campus (room and board) usually cost about $12,000 to $15,000 per student. [7]

  7. 500 - Wikipedia

    en.wikipedia.org/wiki/500

    Fiat 500 (2007) (2007–2020) Fiat New 500 (2020–present) Ford Five Hundred, an American full-size sedan; Lexus LC 500, a Japanese sports coupe Lexus LC 500 GT500, a racing variant of the LC 500; Mercedes-Benz 500, a series of German luxury cars; Eunos 500, a compact executive car; Tank 500, a mid-size luxury SUV; Dodge 500, a heavy-duty truck

  8. History of science and technology in Africa - Wikipedia

    en.wikipedia.org/wiki/History_of_science_and...

    Mathematical notation was decimal, and based on hieroglyphic signs for each power of ten up to one million. Each of these could be written as many times as necessary to add up to the desired number; so to write the number eighty or eight hundred, the symbol for ten or one hundred was written eight times respectively. [57]

  9. List of gear nomenclature - Wikipedia

    en.wikipedia.org/wiki/List_of_gear_nomenclature

    The standard reference pitch diameter is the diameter of the standard pitch circle. In spur and helical gears, unless otherwise specified, the standard pitch diameter is related to the number of teeth and the standard transverse pitch. It is obtained as: [1] = = = ⁡