The initial mass of a certain species of fish is 33 million tons. The mass of fish, if left alone, would increase at a rate proportional to the mass, with a proportionality constant of 55/yr. However, commercial fishing removes fish mass at a constant rate of 1616 million tons per year.

a. When will all the fish be gone?
b. If the fishing rate is changed so that the mass of fish remains constant, what should that rate be?

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.