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Answer:
Step-by-step explanation:
The temperature change that occurred was -21 - - 3 = - 18 degrees
This occurred in 6 hours.
-18/6 = - 3
So each hour during the six hours the temperature went down 3 degrees.
- 3
- 6 the first hour
-9 the second hour
-12 the third hour
-15 the fourth hour
-18 the fifth hour
-21 the sixth hour