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No doubt, staying on-campus saves students time and commuting costs. That benefit is more unequivocal concerning those who live far from schools or in faraway places because their commuting costs may be better spent on extra classes or appurtenances of student life.

Is 'appurtenance' used correctly?

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Nhật BìnhNo doubt, staying on-campus saves students time and commuting costs. That benefit is more unequivocal for those who live far from schools or in faraway places because their commuting costs may be better spent on extra classes or the appurtenances of student life.
Nhật BìnhIs 'appurtenance' used correctly?

Yes.

"appurtenance(s)" is a relatively uncommon formal word, but it is OK to use where appropriate. Most often it is used in the plural.