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...data. This is more than a matter of arithmetic. By Roger Bacon's time the basic ideas of algebra had been developed, mainly by Arabic mathematicians and astronomers. The idea of representing a quantity by a symbol, such as x or t is extremely powerful because it allows us to express general relationships in a very compact way. For example, in the equation the symbol h...

...data stored in the calculator using the key sequence (CLR) (Memory) (Yes) . Note that this clears all the calculator memories. To store the result of an expression just calculated (i.e. an answer displayed in the output area of the calculator screen) in the ‘M’ calculator memory, use the key sequence (STO) (M). Here we are using the second function of the (or recall)...