答案:B
解析:
Choice B is correct. In 1991, t=0 and the equation gives f(0)=51.35. In 2012, t=21 and the equation gives f(21)=523.05. Therefore the population has increased by a factor of approximately 10 after 21 years.
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答案:B
解析:
Choice B is correct. In 1991, t=0 and the equation gives f(0)=51.35. In 2012, t=21 and the equation gives f(21)=523.05. Therefore the population has increased by a factor of approximately 10 after 21 years.