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If the student has grades of 62,67,75, and 89 on the first four exams, what is the student's grade before taking the the final exam? and what is the lowest score the student can earn on the last exam to get a C (70) in the course?

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Current grade = (62+67+75+89)/4 = ?

Total grade = (62+67+75+89+x)/5 = 70

Solve for x.

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