Take another look at the sentence:

Belinda hates her psychology class, although her professor is an interesting lecturer, the auditorium is right next to the copy center, and the whump, whump, whump of the machines always makes Belinda drowsy.

The comma between center and and is correct. The auditorium is right next to the copy center is a main clause. The whump, whump, whump of the machines always makes Belinda drowsy is another main clause. A comma and a coordinating conjunction like and are a legal way to join two main clauses.

Go back to the sentence to try again.

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