Answer:
-3
Step-by-step explanation:
since temp dropped from 0 to 6 3/5 below 0, then the temperature is NEGATIVE
to find temp/hour you divide -6 3/5 degrees by 2 1/5 hours
put in common denominator
-6 3/5 is same as -6*5+3 / 5 or -30+3 / 5 or -33/5
2 1/5 is same as 2*5+1 /5 or 10+1 / 5 or 11/5
-33/5 divided by 11/5 is same as -3
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