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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?
  • a)
    40
  • b)
    45
  • c)
    50
  • d)
    55
  • e)
    60
Correct answer is option 'B'. Can you explain this answer?

Answers

Substitute 140 for R in the given equation and solve for x.
140 = 176 - 0.8x
-36 = -0.8x
-36/-0.8 = x
45 = x

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Substitute 140 for R in the given equation and solve for x.140 = 176 - 0.8x-36 = -0.8x-36/-0.8 = x45 = x