algebra A055,

World Records in the 1500-m Run. The formula R = -0.075t + 3.85 can be used to predict the world record in the 1500-m run t years after 1930. Determine (in terms of an inequality) those years for which the world record will be less than 3.5 min.

{ Y l Y > 1930 } ?

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asked by martin
  1. you just need t where

    -0.075t + 3.85 < 3.5
    0.075t > 0.35
    t > 4.67

    So, any year after 1935

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    posted by Steve

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