题目信息
The maximum recommended pulse rate R, when exercising, for a person who is x years of age is given by the equation $$ R = 1 76 - 0.8x$$ . What is the age, in years, of a person whose maximum recommended pulse rate when exercising is 140?
A:40
B:45
C:50
D:55
E:60
参考答案及共享解析

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正确答案:
B:45
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