The association between velocity during exercise and blood lactate concentration after submaximal 800-m exercise of thoroughbred racehorses on sand and grass tracks has been studied. The lactate-velocity relationship can be described by the functions

 where ∫₁ (v) and 1₂ (v) are the lactate concentrations (in mmol/L) and v is the velocity (in m/sec) of the horse during workout on sand and grass tracks, respectively. Sketch the graph of both functions for 13 ≤ y ≤ 17.

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,0.33v 4₁ (v) = 0.08e0 1₂(v) = -0.87² +28.17v and - 211.41,