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  2. Guide number - Wikipedia

    en.wikipedia.org/wiki/Guide_number

    To convert a guide number given in meters to feet, divide by 0.3048. To convert a guide number given in feet to meters, multiply by 0.3048. Calculating with guide numbers. It is easy to use guide numbers to calculate either an aperture or a flash-to-subject distance.

  3. 42 (number) - Wikipedia

    en.wikipedia.org/wiki/42_(number)

    Forty-two (42) is the sixth pronic number [1] and the eighth abundant number, [2] with an abundance of 12, [3] equal to the average of its eight divisors as an arithmetic number. [4] [5] Its prime factorization makes it the second sphenic number, and also the second of the form . [6] 42 is the aliquot sum of 30, [7] the smallest sphenic number ...

  4. HP-12C - Wikipedia

    en.wikipedia.org/wiki/HP-12C

    Power consumption. 0.25 mW. Weight. 113 g. Dimensions. 128 × 79 × 15 mm. The HP-12C is a financial calculator made by Hewlett-Packard (HP) and its successor HP Inc. as part of the HP Voyager series, introduced in 1981. It is HP's longest and best-selling product and is considered the de facto standard among financial professionals.

  5. Phrases from The Hitchhiker's Guide to the Galaxy - Wikipedia

    en.wikipedia.org/wiki/Phrases_from_The_Hitchhiker...

    The shape of the islands in the background spells out 42, and there are 42 coloured balls. The 42 Puzzle is a game devised by Douglas Adams in 1994 for the United States series of The Hitchhiker's Guide to the Galaxy books. The puzzle is an illustration consisting of 42 multi-coloured balls, in 7 columns and 6 rows.

  6. Scott Flansburg - Wikipedia

    en.wikipedia.org/wiki/Scott_Flansburg

    Scott Flansburg (born December 28, 1963) is an American dubbed "The Human Calculator" and listed in the Guinness Book of World Records for speed of mental calculation. He is the annual host and ambassador for The National Counting Bee, a math educator, and media personality. He has published the books Math Magic and Math Magic for Your Kids.

  7. Adding machine - Wikipedia

    en.wikipedia.org/wiki/Adding_machine

    An adding machine is a class of mechanical calculator, usually specialized for bookkeeping calculations. In the United States, the earliest adding machines were usually built to read in dollars and cents. Adding machines were ubiquitous office equipment until they were phased out in favor of calculators in the 1970s and by personal computers ...

  8. Stirling numbers of the first kind - Wikipedia

    en.wikipedia.org/wiki/Stirling_numbers_of_the...

    Definitions. Stirling numbers of the first kind are the coefficients in the expansion of the falling factorial. into powers of the variable : For example, , leading to the values , , and . Subsequently, it was discovered that the absolute values of these numbers are equal to the number of permutations of certain kinds.

  9. 4 Reasons You Definitely Need Homeowners Insurance - AOL

    www.aol.com/4-reasons-definitely-homeowners...

    The biggest reason for this trend is homeowners insurance is now more expensive than ever. According to a 2023 report from PolicyGenius, rates increased by roughly 21% between May 2022 and May ...

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