Answer:
Parentheses enclose added material.
Parentheses enclose numerical figures that confirm written numbers.
Parentheses enclose explanatory material.
A parenthetic expression is a group of words, an idea, that is not closely related to the rest of the sentence.
Explanation:
Parentheses come always in pairs and they are a literary device used by the author to give additional information about a certain topic written in the sentence. It could be a word, a phrase or even a number, but the main characteristic of parentheses is that the information must not be related grammatically with the rest of the sentence.
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