Question

help please

Brain weight B as a function of body weight W in fish has been modeled by the power function B=.007W2/3, 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=.12L2.53. 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

Answer 1

Use W and B to get a formula with just B and L.
Find B when L is 20 cm and when L is 15cm
Subtract those 2 numbers B1 and B2 and divide by 10 million to get your rate

Answer 2

convert to nanogram/yr

Answer 3

i dont get it