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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. iPhone - Wikipedia

    en.wikipedia.org/wiki/IPhone

    The iPhone XR included a 6.1-inch LCD "Liquid Retina" display, with a "bezel-less" design similar to the iPhone X, but does not include a second telephoto lens; it was made available in a series of vibrant colors, akin to the iPhone 5c, and was a lower-cost device compared to the iPhone X and XS.

  4. Plus–minus sign - Wikipedia

    en.wikipedia.org/wiki/Plus–minus_sign

    The plus–minus sign or plus-or-minus sign (±) and the complementary minus-or-plus sign (∓) are symbols with broadly similar multiple meanings. In mathematics , the ± sign generally indicates a choice of exactly two possible values, one of which is obtained through addition and the other through subtraction .

  5. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    15 669 601 204 101: Once every 43 billion years (never in the history of the Universe, twice in the future of the Local Group before its merger) μ ± 8σ: 0.999 999 999 999 999: 1.244 × 1015 = 1.244 ppq: 1 in 803 734 397 655 348: Once every 2.2 trillion years (never in the history of the Universe, once during the life of a red dwarf) μ ...

  6. Less-than sign - Wikipedia

    en.wikipedia.org/wiki/Less-than_sign

    The widely adopted form of two equal-length strokes connecting in an acute angle at the left, <, has been found in documents dated as far back as the 1560s. In mathematical writing, the less-than sign is typically placed between two values being compared and signifies that the first number is less than the second number.

  7. Saving vs. investing: Which strategy works best for growing ...

    www.aol.com/finance/saving-vs-investing...

    Plus, even if your bank runs into trouble, the FDIC insures your savings at member institutions for up to $250,000 per depositor, per bank. However, keeping too much in savings can cost you over time.

  8. Plus–minus - Wikipedia

    en.wikipedia.org/wiki/Plus–minus

    Plus–minus sign (±), a mathematical symbol which can mean either plus (+) or minus (−), or can indicate the uncertainty of a measurement or statistic; Plus–minus (sports), a sports statistic used to measure a player's impact on the game; Plus–minus method, a geophysical method to interpret seismic refraction profiles

  9. iOS - Wikipedia

    en.wikipedia.org/wiki/IOS

    The feature was initially only available on the iPad (1st generation) until the release of iOS 4 a few months after the release of iPhone OS 3.2, which brought the feature to all iPhone and iPod Touch models that could run the operating system, with the exception of the iPhone 3G and the iPod touch (2nd generation) due to performance issues ...