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  2. Mathcounts - Wikipedia

    en.wikipedia.org/wiki/Mathcounts

    The Mathcounts Competition Series spread quickly in middle schools, and today it is the best-known middle school mathematics competition. [6] In 2007 Mathcounts launched the National Math Club as a noncompetitive alternative to the Competition Series. In 2011, Mathcounts launched the Math Video Challenge Program, which was discontinued in 2023 ...

  3. Betrothed numbers - Wikipedia

    en.wikipedia.org/wiki/Betrothed_numbers

    Quasi-sociable numbers or reduced sociable numbers are numbers whose aliquot sums minus one form a cyclic sequence that begins and ends with the same number. They are generalizations of the concepts of betrothed numbers and quasiperfect numbers.

  4. HP 48 series - Wikipedia

    en.wikipedia.org/wiki/HP_48_series

    The HP 48 is a series of graphing calculators designed and produced by Hewlett-Packard from 1990 until 2003. [1] The series includes the HP 48S , HP 48SX , HP 48G , HP 48GX , and HP 48G+ , the G models being expanded and improved versions of the S models.

  5. HP 49/50 series - Wikipedia

    en.wikipedia.org/wiki/HP_49/50_series

    They are the successors of the HP 48 series. There are five calculators in the 49/50 series of HP graphing calculators. These calculators have both algebraic and RPN entry modes, and can perform numeric and symbolic calculations using the built-in Computer Algebra System (CAS), which is an improved ALG48 and Erable combination from the HP 48 ...

  6. Order of operations - Wikipedia

    en.wikipedia.org/wiki/Order_of_operations

    Calculators generally perform operations with the same precedence from left to right, [1] but some programming languages and calculators adopt different conventions. For example, multiplication is granted a higher precedence than addition, and it has been this way since the introduction of modern algebraic notation .

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    The current average rate for a 30-year fixed mortgage is 6.89% for purchase and 6.93% for refinance — up 1 basis point from 6.88% for purchase and 3 basis points from 6.90% for refinance last ...

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