What is the average score of a class if there are 20 students and their scores are 75, 80, 90, 85, 92, 88, 78, 86, 97, 79, 83, 91, 84, 87, 89, 76, 82, 81, 93, and 77?
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What is the measure of a missing angle in a triangle if the other two angles are 45° and 75°?
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Math question: Expand and simplify: (3x + 4)(2x - 5) using the distributive property.