If one or more sentences are between parentheses, then put the period or other final punctuation between the parentheses:
Always thank the bellboy. (Usually you should also tip him.)
Otherwise put the period or other final punctuation outside the final parenthesis:
Always thank the bellboy (and any other staff who has aided you).
The period or other final punctuation belongs to the sentence as a whole. If the entire sentence is within parentheses, naturally that includes the final punctuation. If the parentheses enclose only part of sentence, naturally the final punctuation goes outside.
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This is called an ordered number pair
No difference. (-8)5 = (-85) = -85
Period = wavelength/speed