Question

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.

Answer 1

where r u stuck at? do you have an equation made up?

Answer 2

like i don't even know what equation to use, that's the problem

Answer 3

oh haha I get that way too, sooo....

Answer 4

so here are all that we know:
B=.007W2/3
W=.12L2.53

15cm to 20cm
18cm [find]

Answer 5

do you see how it says, "constant rate"
it means slope of a line,

what class is this? algebra?

Answer 6

are you guys going over the 'line equation'?

Answer 7

B=.007(.12L2.53)2/3
y=.007(.12x2.53)2/3
m = (y-y)/(x-x)
find the slope, plug in the 15 and 20 in for x and get y, then find the slop[e