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?
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Math Question: Find the local maximum and minimum of the function f(x) = 2x^3 - 6x^2 - 18x
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What is the perimeter of a rectangle with length 10 units and width 6 units?