Edward C. answered 10/01/15
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Drop means to fall or go down, so whenever the temperature drops by a certain amount you need to subtract that amount from the previous temperature
At 6 a.m. the temperature is 32 degrees
At the first recording at 8 a.m. the temperature is 32 - 3 = 29 degrees
At the second recording the temperature is 29 - 5 = 24 degrees
At the third and final recording the temperature is 24 - 5 = 19 degrees