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The maximum recommended pulse rate R, when exercising, for a person who is x years of age is given by the equation R = 176 -0.8x. What is the age, in years, of a person whose maximum recommended pulse rate when exercising is 140?
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R = 176 -0.8x

When R = 140;

140 = 176 - 0.8x

0.8x = 176 - 140 = 36

x = 36/0.8 = 45 years
by Diamond (40,716 points)

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