The cutlassfish is a valuable resource in the marine fishing industry in China. A von Bertalanffy model is fit to data for one species of this fish giving the length of the fish, L(a) (in mm), as a function of the age, a (in yr). An estimate of the length of this fish is L(a) = 612 – 400e-0.17a . Differentiate L(a) with respect to a, L'(a) = I mm/yr. Determine how fast the average fish is growing when it is 7 years old. L'(7) = H mm/yr.

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