1. The best course grade the friend can earn is C+ or 77.35%.
2. The minimum score that the friend requires on the final exam to earn 75% for the course is 15.5%
The final scores are determined proportionately to the before and final exam scores.
Average score before final exam = 85%
The score for the final exam = 30%
Scores before final exam = 70% (1 - 30%)
The score already earned by the friend before the final exam = 59.5% (85% of 70%)
If the friend maintains the same score rating, he will earn 17.85% (59.5% x 30%) during the final exam.
1) This will result in a total of 77.35% (59.5% + 17.85%).
2) The minimum score the friend requires on the final exam to earn 75% for the course is 15.5% (75% - 59.5%).
Thus in percentage terms, the friend will earn a final score of 77.35%.
Learn more about using percentages to express values at https://brainly.com/question/843074
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