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26 December, 03:43

At 9:00 AM, the temperature started dropping 2°C per hour until it reached - 13°C at 1:00 PM. What was the temperature at 9:00 AM?

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  1. 26 December, 05:54
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    9:00 am to 1:00 pm is 4 hours.

    The temperature dropped 2 degrees every hour so 2 x 4 = 8 total degrees.

    Add 8 degrees to the final temperature to find the starting temperature.

    -13 + 8 = - 5 degrees at 9:00 am.
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