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How does this work?
Usually, teachers will have weighted categories that determine your grade: Homework, Classwork, Test/Quizzes, and the dreadful Final. Because the Final category stays at 0/0, an indeterminate form, all year long, it's counted as the average of all your other categories and does not affect your grade. Therefore, your final grade can be calculated using the formula:
Grade = Exam Worth × Exam Score + (1 - Exam Worth) × Current Grade
It's not rocket science, it's just math! You could, of course, do this on any calculator, but you could come to RogerHub too because it's cool. (: