To find the amount of change in temperature every hour, we can set up the equation based on the information given.
The total temperature drop is 12° over 5 hours, with the temperature dropping the same amount (x) each hour. Thus, we can express the total drop as:
\[ 5x = 12 \]
Now, we can solve for x:
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Divide both sides of the equation by 5: \[ x = \frac{12}{5} \]
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Simplifying this fraction gives us: \[ x = 2.4 \]
So, the temperature decreased by 2.4° every hour.