Math Question: Find the absolute extrema of the function f(x) = x^3 + 2x^2 - 4x on the interval [-2, 3].
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Question: How many ways can 5 friends be seated in a row if 2 of them insist on sitting together?
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What is the average weight of 20 students in a class if their weights are 120, 130, 135, 140, 125, 130, 135, 150, 155, 125, 130, 140, 135, 130, 145, 160, 155, 150, 135, and 140 pounds?