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From the mid-1950s through the 1960s, in the U.S. the common home record player or "stereo" (after the introduction of stereo recording) would typically have had these features: a three- or four-speed player (78, 45, 33 + 1 ⁄ 3, and sometimes 16 + 2 ⁄ 3 rpm); with changer, a tall spindle that would hold several records and automatically ...
A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]
Madeline 1st and 2nd Grade Math, the final game in the series, was released as a two-CD-ROM set on July 12, 1999. [12] The discs were also sold separately as Madeline 1st Grade Math and Madeline 2nd Grade Math. Set in the Louvre and the Musée d'Orsay, Madeline guides the player through nine works of art.
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The 7-inch 45 rpm record was released March 31, 1949, by RCA Victor as a smaller, more durable and higher-fidelity replacement for the 78 rpm shellac discs. [12] The first 45 rpm records were monaural, with recordings on both sides of the disc. As stereo recordings became popular in the 1960s, almost all 45 rpm records were produced in stereo ...
A multisided record is a type of vinyl record that has more than one groove per side. This technique allows hidden tracks to be encoded on LPs, 45 rpms and 78 rpms. On a disc that has a multi-groove, whether the listener plays the main track or the hidden track depends on where the stylus is cued.
In addition to giving area formulas and methods for multiplication, division and working with unit fractions, it also contains evidence of other mathematical knowledge, [33] including composite and prime numbers; arithmetic, geometric and harmonic means; and simplistic understandings of both the Sieve of Eratosthenes and perfect number theory ...