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13 September, 05:40

In a science experiment the temperature of a substance is changed from 42 °F to - 54 °F at an average rate of - 12 degrees per hour. Over how many hours does the change take place? The answer is 8 hours I need the work for it though.

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  1. 13 September, 06:37
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    The drop in temperature is 42 - (-54) = 42+54=96℉. Rate of drop is 12℉. So it will take 96/12=8 hours.

    Another way: - 54-42=-96, - 96/-12=8 hours.
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