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In November 2016, Cengage Learning rebranded as simply Cengage. [citation needed] In May 2019, Cengage announced its potential merger with another major publisher, McGraw-Hill Education, thereby creating a duopoly with Pearson in the market and would have used McGraw-Hill as the merged corporate name with Michael Hansen as CEO.
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Crossword-like puzzles, for example Double Diamond Puzzles, appeared in the magazine St. Nicholas, published since 1873. [31] Another crossword puzzle appeared on September 14, 1890, in the Italian magazine Il Secolo Illustrato della Domenica. It was designed by Giuseppe Airoldi and titled "Per passare il tempo" ("To pass the time"). Airoldi's ...
Puzzle books may contain puzzles all of simply one type like (e.g. crosswords, sudoku, or wordsearch) or a mixture of different puzzle types. Puzzle books may be aimed for either adults or children. Puzzle books can be used for many purposes such as education or purely for entertainment. The first crossword puzzle book was published in 1924 by ...
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Algebra is the branch of mathematics that studies certain abstract systems, known as algebraic structures, and the manipulation of expressions within those systems. It is a generalization of arithmetic that introduces variables and algebraic operations other than the standard arithmetic operations, such as addition and multiplication.