He would only need 3 because
Knitted Caps=2
so that means
4(2) Knitted caps=8
3(2) knitted caps = 6
The zeroes are also the x-intercept or the roots of the function
The scientist would use milligrams, grams, and kilograms.
The best procedure would be to randomly pick 52 fish from the entire pond and weigh each of them as this would be the most unbiased way to achieve the average mass