Question: What is the area of a rectangle with length 10 cm and width 5 cm, if the perimeter is equal to the circumference of a circle with radius 7 cm?
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What is the maximum value of f(x) = 3x^2 + 5x - 2 in the interval (-1, 2)?
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What is the variance of the numbers 4, 6, 8, 10, and 12?