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When John turned on the air conditioner, the house temperature decreased. What does h(40) = 81 mean?
a. After 40 minutes, the house was cooled to 810°F
b. After 40 minutes, the house was cooled to 81°F
c. After 40 minutes, the house is 810°F cooler than when the air conditioner started
d. After 40 minutes, the house is 81°F cooler than when the air conditioner started

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