Question

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Answer 1

Parentheses are used to enclose extra information, such as a passing comment, a minor example or addition, or a brief explanation.

For example,
(Page # lines # to #, last name of author)
This shows information of certain lines which are part of a text.
She (Name) furiously stomps away from the group.
This shows information by specifying who the person is by stating their name in parentheses.