AM-321
Exponential and logarithmic models
A Math · Secondary 3 · Hard · Exponential and logarithmic models
The temperature, in °C, of a cup of coffee is modeled by
, where is the time in minutes after it is poured.
Find the time taken for the coffee to cool to , correct to 3 significant figures.
, where is the time in minutes after it is poured.
Find the time taken for the coffee to cool to , correct to 3 significant figures.
- 9.65 minutes
- 11.2 minutes
- 13.4 minutes
- 16.1 minutes
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