SAT官方每日一题附答案和解析[数学](2019年8月15日)

Mathematics

Black-footed ferrets are the only ferret species native to North America, but they were nearly extinct in the 1970s. Since then, efforts have been made to breed the ferrets in captivity and reintroduce them to the wild. The function f represents the current total population of black-footed ferrets in North America t years after 1991.

f(t)=51.35*1000^(2t/125)

To the nearest year, how many years did (or will) it take for the population to be 10 times larger than it was in 1991?

A.4 years
B.21 years
C.51 years
D.63 years

 重点单词 查看全部解释 extinct [iks'tiŋkt] 想一想再看 adj. 灭绝的，熄灭的，耗尽的 联想记忆 current ['kʌrənt] 想一想再看 n. (水、气、电)流，趋势adj. 流通的 联想记忆 equation [i'kweiʃən] 想一想再看 n. 相等，方程(式), 等式，均衡 联想记忆 ferret ['ferit] 想一想再看 n. 白鼬，雪貂，侦探 v. 用雪貂打猎，搜出，驱出 approximately [ə'prɔksimitli] 想一想再看 adv. 近似地，大约 factor ['fæktə] 想一想再看 n. 因素，因子vt. 把 ... 因素包括 联想记忆 population [.pɔpju'leiʃən] 想一想再看 n. 人口 ，(全体)居民，人数 联想记忆 species ['spi:ʃiz] 想一想再看 n. （单复同）物种，种类 function ['fʌŋkʃən] 想一想再看 n. 功能，函数，职务，重大聚会vi. 运行
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