Integration by Substitution. The rate of growth of Grass carp, one of the most common type of fish, was modelled by the equation 5х + 10 f(t) = x2 + 4x + 4 where t is measured in years and f(t) in kilograms per year. Consider the integral 2 5x + 10 dx lo x2 + 4x + 4 After substitution into u, the new integral can be written du (a) The value of A is O 2.5 O 5x O x + 2 O 5 O 5x + 2 O x O 10 (b) The upper limit of integration b is O -4 8 О 32 O 2 O 4 O O O

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