Find the values of x which satisfy the equation x³ + 3x² - 4x - 12 = 0.
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What is 80% of 150?
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What is the average age of students in a class with 25 students, if the ages are 18, 20, 21, 18, 19, 22, 20, 19, 17, 21, 18, 20, 19, 22, 21, 20, 19, 17, 19, 20, 21, 19, 18, 20, 19?