Mathematics for IGCSE & O level - Graphs Of Functions (Section 3 - No. 45)
In the coffee problem where T = 60 * 0.9^x + 20, what is the temperature of the coffee when Irina makes it?
60
20
80
0
Explanation
The temperature of the coffee when Irina makes it, the time, x, will equal to 0, and the calculation is: T = 60 * 0.9^0 + 20 = 80.
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