The expression for the temperature after t hours of sunset is, 5 - 2t.
Temperature reduces by 2°C per hour from 5°C every hour after sunset.
Assuming there are t hours after sunset, the temperature would be:
= Beginning temperature - (Reduction rate x number of hours after sunset)
= 5 - (2 x t)
= 5 - 2t
You can therefore find the temperature after t hours of sunset using the formula, 5 - 2t.
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