What is the average temperature (in degrees Celsius) of a city for the past 30 days if the daily temperatures were 25°C, 30°C, 28°C, 23°C, 26°C, and 24°C?
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What is the area of a triangle with side lengths 9 cm, 12 cm, and 15 cm, using Heron’s Formula?
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Math question: What is the derivative of the function f(x) = 5x^3 - 2x^2 + 7x - 1?