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In a science experiment, the temperature of a substance is changed from 42 degrees Fahrenheit to -54 at an average rate of-12 degrees Fahrenheit per hour. Over how many hours does the change take place

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sqdancefan

Answer:

  8 hours

Step-by-step explanation:

The time required is the temperature difference divided by the rate of change of temperature:

  (-54 -42)°F/(-12 °F/h) = -96/-12 h = 8 h

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