Find the sum of the first n natural numbers using the sum formula: S=n(n+1)/2. Calculate S when n=100.
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Math Question: Find the maximum or minimum value of the function f(x) = 3x^2 - 4x + 5 within the interval [-2, 4].
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Math Question: The angle of elevation of a ladder leaning against a wall is 60°. If the bottom of the ladder is 5 meters away from the wall, how long is the ladder?