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prediction in part (b). 17. The von Bertalanffy growth model is used to predict the length L(¢) of a fish over a period of time. If L.. is the largest length for a species, then the hypothesis is that the rate of growth in length is proportional to L.. — L, the length yet to be achieved. (a) Formulate and solve a differential equation to find an expression for L(t). (b) For the North Sea haddock it has been determined that L.. = 53 cm, L(0) = 10 cm, and the constant of propor- tionality is 0.2. What does the expression for L(¢) become with these data?