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The temperature T°C of a cup a tea t minutes after being poured is modelled by the exponential decay function:
T=18+68e^-t/8, t>/= 0
a) What is the initial temperature of the tea the moment it was poured?
b) When will the temperature of the tea reach 35°C?
c) Explain why the tea will never reach an ambient temperature of 15°C.
Sagot :
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