# Answer on Calculus Question for hsd

Question #17237

Brain weight B as a function of body weight W in fish has been modeled by the power function B=.007W^(2/3), where B and W are measured in grams. A model for body weight as a function of body length L (measured in cm) is W=.12L^(2.53). If, over 10 million years, the average length of a certain species of fish evolved from 15cm to 20cm at a constant rate, how fast was the species' brain growing when the average length was 18cm? Round your answer to the nearest hundredth.

=......................nanograms/yr

=......................nanograms/yr

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