lowealiyah1055
23.10.2020 •
Mathematics
Dequan is making homemade ice cream which needs to be frozen gradually to achieve the best texture. When he starts, the temperature of the ice cream is 50°F. The temperature drops 5°F each hour for the next 3 hours. Dequan then puts it in a deep freezer causing the temperature to drop 13°F. Which integer best represents the change in the temperature of the ice cream from start to finish? -28°F -28°F -13°F -13°F 13°F 13°F 28°F
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Ответ:
The change in the temperature of the ice cream from start to finish is -28°F
Step-by-step explanation:
From the question,
Initial temperature of the ice cream is 50°F.
Also, the temperature drops 5°F each hour for the next 3 hours; that is for every hour in the next 3 hours, the initial temperature decreases by 5°F.
Then after 3 hours, the initial temperature would have decreased by 3 × 5°F;
3 × 5°F = 15°F
Hence, after 3 hours, the temperature of the ice cream would be 50°F -15°F;
50°F - 15°F = 35°F
After 3 hours, the temperature of the ice cream would be 35°F.
From the question,
Dequan then puts it in a deep freezer causing the temperature to drop 13°F
Now, the final temperature of the ice cream is 35°F - 13°F = 22°F
The final temperature of the ice cream is 22°F.
To determine the change in the temperature of the ice cream from start to finish,
Change in temperature = Final temperature - Initial temperature
Change in temperature = 22°F - 50°F = -28°F
Hence, the change in the temperature of the ice cream from start to finish is -28°F.
Ответ: