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16. The microbe concentration B(x), in appropriate units, of a certain lake depends approximately on the oxygen concentration x, again in appropriate units, according to

16. The microbe concentration B(x), in appropriate units, of a certain lake depends approximately on the oxygen concentration x, again in appropriate units, according to the following function. Answer parts (a) and (b) B(x)= x43 - 11x^2 - 168x + 2267; (0

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