Change per hour

On Sunday, the temperature was 63 degrees at 2 PM. The temperature was then 72 degrees at 5 PM. What is the rate of change per hour?

Correct answer:

r =  3 °F/h

Step-by-step explanation:

t1=63 °F t2=72 °F  T=52=3 h  r=Tt2t1=37263=3°F/h

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