Leonardo read that his reptile food should be given at a temperature of 72.5°F. He keeps the food in the freezer at –4°F. He has found that if he sets the food on his reptile’s hot rock, the temperature rises 8.5 degrees each hour. How many hours will it take for the reptile food to reach 72.5°F? 72.5 = -4 + 8.5h76.5 = 8.5h
The food must warm from −4°F to 72.5°F, a temperature increase of 72.5 − (−4) = 76.5 degrees. At 8.5 degrees per hour, the time is 76.5 ÷ 8.5 = 9 hours. The correct choice is 9 hours.
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