Math question: In triangle ABC, angle A is bisected by segment BD. If angle A measures 80 degrees, angle B measures 60 degrees, and angle C measures 40 degrees, what is the measure of angle BAD?
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How many sides does a polygon have if the sum of its interior angles is 900 degrees?
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Question: Find the minimum value of the function f(x) = x^3 - 6x^2 + 9x + 2 on the interval [-1, 3].