A hot dish is placed in a refrigerator and then removed from the refrigerator after eighty-five minutes. Suppose that the function D(t) represents the temperature of the dish, in degrees Centigrade, t minutes after the dish is placed in the refrigerator. Responding with complete sentences and appropriate units: A. What is the meaning of the derivative, D'(t)? B. What does D'(25) = 8 mean in this situation? C. Is D' (t) always negative? Or does it change sign? Explain.

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