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  2. Progressivity in United States income tax - Wikipedia

    en.wikipedia.org/wiki/Progressivity_in_United...

    U.S. federal income (individual and corporate) and payroll tax rates by income percentile and component as projected for 2014 by the Tax Policy Center. [5] CBO Median Income Tax Rates CBO Data Shares of Market Income and Net Federal Taxes, By Income Group, 2010 CBO Data Shares of Market Income and Net Federal Taxes, By Income Group, 2010 - 99% and 1%

  3. Half-life - Wikipedia

    en.wikipedia.org/wiki/Half-life

    Toggle Formulas for half-life in exponential decay subsection. 2.1 Half-life and reaction orders. 2.1.1 Zero order kinetics. ... Fraction remaining Percentage

  4. Gini coefficient - Wikipedia

    en.wikipedia.org/wiki/Gini_coefficient

    Assuming non-negative income or wealth for all, the Gini coefficient's theoretical range is from 0 (total equality) to 1 (absolute inequality). This measure is often rendered as a percentage, spanning 0 to 100. However, if negative values are factored in, as in cases of debt, the Gini index could exceed 1.

  5. Community Development Block Grant - Wikipedia

    en.wikipedia.org/wiki/Community_Development...

    A city's proportion of the overall CDBG allocation is either the average of the area's fractions of the US's total population, total poverty and total amount of housing overcrowding, or the average of the area's fractions of the country's total growth lag, total poverty, and total age of housing. [13]

  6. National debt of the United States - Wikipedia

    en.wikipedia.org/wiki/National_debt_of_the...

    The difference is the "intragovernmental debt," which includes obligations to government programs such as Social Security. Stated as a formula, National Debt = Debt held by the Public + Intragovernmental Debt. The second panel shows the two debt figures as a percentage of U.S. GDP (dollar value of U.S. economic production for that year).

  7. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    The latter fraction is the best possible rational approximation of π using fewer than five decimal digits in the numerator and denominator. Zu Chongzhi's results surpass the accuracy reached in Hellenistic mathematics, and would remain without improvement for close to a millennium.

  8. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    Water is an inorganic compound with the chemical formula H 2 O.It is a transparent, tasteless, odorless, [c] and nearly colorless chemical substance.It is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent [20]).

  9. Chemical element - Wikipedia

    en.wikipedia.org/wiki/Chemical_element

    Only the fraction of the mass and energy labeled "atoms" is composed of elements. Only about 4% of the total mass of the universe is made of atoms or ions, and thus represented by elements. This fraction is about 15% of the total matter, with the remainder of the matter (85%) being dark matter. The nature of dark matter is unknown, but it is ...