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A metal bar is heated and then allowed to cool. Its temperature T (in C) is found to be T=20+50 e 0.35t, where t (in

A metal bar is heated and then allowed to cool. Its temperature T (in

C)

is found to be

T=20+50e0.35t,

where t (in min) is the time of cooling. Find the time rate of change of temperature after

15.0

min.

After

15.0

minutes, the time rate of change is__________

degrees per minute.

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