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Sometimes the − is used to indicate a better grade if it stands after the grade and a lower grade if it stands before the grade (in which case − is a symbol for "bis", e.g. 'to', rather than 'minus'), for example −5 (4.75) is lower than 5 which is lower than 5− (5.25) in that system. In some regions, decimal grades are used: 5.5, 4.5, etc.
If the grade would be a 5.49 and one decimal is used, the 5.49 will be a 5.5, but if no decimals are used (usually at the end of the year) the 5.49 will end up as a 5 which indicates a fail.
As another example, a two-year return of 10% converts to an annualized rate of return of 4.88% = ((1+0.1) (12/24) − 1), assuming reinvestment at the end of the first year. In other words, the geometric average return per year is 4.88%. In the cash flow example below, the dollar returns for the four years add up to $265.
Examples of unexpected applications of mathematical theories can be found in many areas of mathematics. A notable example is the prime factorization of natural numbers that was discovered more than 2,000 years before its common use for secure internet communications through the RSA cryptosystem. [127]
The Hatter's hat shows an example of the old pre-decimal notation: the hat costs 10/6 (ten shillings and sixpence, a half guinea). Before decimalisation in 1971, the pound was divided into 20 shillings, and each shilling into 12 pence, making 240 pence to the pound. The symbol for the shilling was "s."
Mercury is the first planet from the Sun and the smallest in the Solar System.In English, it is named after the ancient Roman god Mercurius (), god of commerce and communication, and the messenger of the gods.
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