There is no good reason: it is simply a convention.
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Well, according to what I learned when I was in Algebra I, you should never have to use a semicolon.
algebra is the use of letters in an algebraic expression. Chloroform is a type of
To represent variables you don't know, or could be anything.
Roman numerals use letters in place of numbers. An unknown variable in algebra uses a letter instead of a number.
yes.Yup. Scientists use algebra all the time, no question. Even biologists.