Assuming you mean something like (5,7) this is often used for coordinates, in this case 5 along the X (or horizontal) axis and Y up the Y (or vertical) axis.
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Do the work inside the parenthesis first.
you distribute the negative to the inside of the parenthesis
The periods go outside the parenthesis. They wrap everything up.
You can remove parenthesis or bracket by multiplying the number outside, with the number inside the bracket.
"( )" a parenthesis is usually used when you are trying to explain is something in a sentence, but you have the feeling that the reader might not know what you are talking about. So you put a phrase inside the parenthesis to give the reader a hint on what you are trying to explain.