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26 February, 07:50

19.

To calculate her target heart rate. Shayla subtracts her age, a. From 220 and then

takes 70% of the difference. Which equation should Shayla use to calculate r, her

target heart rate?

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Answers (1)
  1. 26 February, 11:15
    0
    I think r=0.7 (220-a)
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