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  2. Relative change - Wikipedia

    en.wikipedia.org/wiki/Relative_change

    Relative change. In any quantitative science, the terms relative change and relative difference are used to compare two quantities while taking into account the "sizes" of the things being compared, i.e. dividing by a standard or reference or starting value. [1] The comparison is expressed as a ratio and is a unitless number.

  3. Fold change - Wikipedia

    en.wikipedia.org/wiki/Fold_change

    Fold change. Fold change is a measure describing how much a quantity changes between an original and a subsequent measurement. It is defined as the ratio between the two quantities; for quantities A and B the fold change of B with respect to A is B / A. In other words, a change from 30 to 60 is defined as a fold-change of 2.

  4. Change of basis - Wikipedia

    en.wikipedia.org/wiki/Change_of_basis

    Change of basis. A linear combination of one basis of vectors (purple) obtains new vectors (red). If they are linearly independent, these form a new basis. The linear combinations relating the first basis to the other extend to a linear transformation, called the change of basis. A vector represented by two different bases (purple and red arrows).

  5. Use your iPhone to impress your friends with these cool ...

    www.engadget.com/2013-11-12-use-your-iphone-to...

    Open your iPhone calculator. Type in the first 3 digits of your phone number (not your area code) (So you would type in 759 if your number was 801-759-1234) Multiply that number by 80 (759 x 80 ...

  6. Change of variables - Wikipedia

    en.wikipedia.org/wiki/Change_of_variables

    In mathematics, a change of variables is a basic technique used to simplify problems in which the original variables are replaced with functions of other variables. The intent is that when expressed in new variables, the problem may become simpler, or equivalent to a better understood problem. Change of variables is an operation that is related ...

  7. Change your AOL account to a free plan - AOL Help

    help.aol.com/articles/change-your-aol-account-to...

    Hover over My Services | click Subscriptions to access your account information. 3. Click Manage next to your subscription. 4. Click Change Plan. 5. Review the confirmation page. It will offer you the option of changing to a lower-priced plan rather than canceling your account. If you'd like to proceed with changing your account to a free AOL ...

  8. Air changes per hour - Wikipedia

    en.wikipedia.org/wiki/Air_changes_per_hour

    Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed and replaced in an hour. If the air in the space is either uniform or perfectly mixed, air changes per hour is a measure of how many times the air within a defined space is replaced each ...

  9. Change-making problem - Wikipedia

    en.wikipedia.org/wiki/Change-making_problem

    The change-making problem addresses the question of finding the minimum number of coins (of certain denominations) that add up to a given amount of money. It is a special case of the integer knapsack problem, and has applications wider than just currency. It is also the most common variation of the coin change problem, a general case of ...

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