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  2. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    In the left part were four beads. Beads in the first row have unitary values (1, 2, 3, and 4), and on the right side, three beads had values of 5, 10, and 15, respectively. In order to know the value of the respective beads of the upper rows, it is enough to multiply by 20 (by each row), the value of the corresponding count in the first row.

  3. List of countries by income inequality - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    Income ratios include the pre-tax national income share held by the top 10% of the population and the ratio of the upper bound value of the ninth decile (i.e., the 10% of people with the highest income) to that of the upper bound value of the first decile (the ratio of the average income of the richest 10% to the poorest 10%).

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    The Babylonians also possessed a place-value system and used a sexagesimal numeral system which is still in use today for measuring angles and time. [ 76 ] In the 6th century BC, Greek mathematics began to emerge as a distinct discipline and some Ancient Greeks such as the Pythagoreans appeared to have considered it a subject in its own right ...

  5. Solubility equilibrium - Wikipedia

    en.wikipedia.org/wiki/Solubility_equilibrium

    Solubility products are often expressed in logarithmic form. Thus, for calcium sulfate, with K sp = 4.93 × 10 −5 mol 2 dm −6, log K sp = −4.32. The smaller the value of K sp, or the more negative the log value, the lower the solubility. Some salts are not fully dissociated in solution.

  6. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    This is a list of articles about prime numbers.A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers.

  7. Luka Dončić - Wikipedia

    en.wikipedia.org/wiki/Luka_Dončić

    He averaged 13.5 points, 5.9 rebounds, and 3.1 assists with the reserve team, helping them win Group B of the Liga EBA, the amateur fourth-division of Spanish basketball. [ 30 ] [ 31 ] By the end of the season, Dončić earned all-league honorable mention accolades from the basketball website Eurobasket.com . [ 30 ]

  8. Energy density - Wikipedia

    en.wikipedia.org/wiki/Energy_density

    The density of thermal energy contained in the core of a light-water reactor (pressurized water reactor (PWR) or boiling water reactor (BWR)) of typically 1 GW (1000 MW electrical corresponding to ≈ 3000 MW thermal) is in the range of 10 to 100 MW of thermal energy per cubic meter of cooling water depending on the location considered in the ...

  9. Misery index (economics) - Wikipedia

    en.wikipedia.org/wiki/Misery_index_(economics)

    Harvard Economist Robert Barro created what he dubbed the "Barro Misery Index" (BMI), in 1999. [3] The BMI takes the sum of the inflation and unemployment rates, and adds to that the interest rate, plus (minus) the shortfall (surplus) between the actual and trend rate of GDP growth.