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Calculus word problems

Brain weight, B as a function of body weight W in fish has been modeled by the power function B=0.007W^(2/3), where B and W are measured in grams. A model for bodyweight as a function of body length L (measured in centimeters) is W=0.12L^(2.53). If, over 10 million years, the average length of a certain species of fish evolvedfrom 15 cm to 20 cm at a constant rate, how fast was this specie's brain growing when the average length was 18cm.

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