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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?


A 8 hours B
1
8
hour
C −8 hours D 1 hour

Respuesta :

jcherry99

Remark

There are a couple of ways to do this. The easiest is to take the number of degrees between 42 and - 54 and divide by 12.

Method

the number of degrees is abs(42) + abs(-54) = 42 + 54 = 96

Now divide by 12

Hours = 96 / 12 = 8 hours. I think the answer is A.

Answer:

Its 8hrs

Step-by-step explanation:

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