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A metal bar is heated and then allowed to cool. Its temperature T (in C) is found to be T=30+75e^-0.15t where t (in min) is

A metal bar is heated and then allowed to cool. Its temperature T (in C) is found to be T=30+75e^-0.15t where t (in min) is the time of cooling. Find the time rate of change of temperature after 15.0 min.

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