“Brain weight B as a function of body weight W in fish has been modeled by the power function B = 0.007W2/3, where B and W are measured in grams. A model for body weight as a function of body length L (measured in centimeters) is W = 0.12L2.53. If, over 10 million years, the average length of a certain species of fish evolved from 16 cm to 23 cm at a constant rate, how fast was this species’ brain growing when the average length was 19 cm? (Round your answer to four significant figures.)” On this problem I had L=19cm a

“Brain weight B as a function of body weight W in fish has been modeled by the power function B = 0.007W2/3, where B and W are measured in grams. A model for body weight as a function of body length L (measured in centimeters) is W = 0.12L2.53. If, over 10 million years, the average length of a certain species of fish evolved from 16 cm to 23 cm at a constant rate, how fast was this species’ brain growing when the average length was 19 cm? (Round your answer to four significant figures.)”

On this problem I had L=19cm and dL/dt=.7cm/million years as some of my given values. I needed to find dB/dt=dB/dW * dW/sL * dL/dt= .007 * 2/3 * w^-1/3 * .12 * 2.53 * L^1.53 * dL/dt. I plugged in L=19 and dL/dt=.7cm to find the answer 0.0151853094 which I rounded to 0.01519. Are my values of L and dL/dt wrong? Thank you

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