Mathematics for IGCSE & O level - Graphs Of Functions (Section 4 - No. 31)
In the coffee problem, if Irina leaves the coffee for 4 minutes, and then drinks it. What is the temperature then?
60
20
64.5
72.2
Explanation
The calculation will be T= 60*0.9^4+20= 60 * 0.6561 + 20=79.366, so it is approx. 72.2
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