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A courteous expression can be made for a club meeting or a telephone conversation. You can choose a phone call to be topic for your courteous expression. You can also use courteous expressions while conducting an interview.
because when you talk a person in polite she or him will say polite words same to you
I think it is important because you need to know it when you get older.
the reason you use letters in algebraic expressions is because you don't know the number so a letter replaces it.
use a calculator