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[Problem Solving]
试题详情
题目：
The temperature of a certain cup of coffee 10 minutes after it was poured was 120 degrees Fahrenheit. If the temperature F of the coffee f minutes after it was poured can be determined by the formula F = 120(2-at) + 60, where F is in degrees Fahrenheit and a is a constant, then the temperature of the coffee 30 minutes after it was poured was how many degrees Fahrenheit?
选项:
A、65
B、75
C、80
D、85
E、90
答案:
B
提问：
怎么算不对。。。a=3/20?
解答：
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阅读753
提问：
怎么算不对。。。a=3/20?
解答：
点赞0
阅读754
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