A metal bar is heated to a certain temperature and then the heat source is removed. At time t minutes after the heat source is removed, the temperature, theta degrees Celsius, of the metal bar is given by theta=280/(1+0.02t). At what rate is the temperature decreasing 100 minutes after the removal of the heat source?

well if you put it that way.

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the answer to this is a. a^2 + b^2 = c^2