f5數學題一問?10點
2011-09-01 6:54 am
Population of black people and white people in city t years after 1st January,2009 are estimates by black people=25000(1.005)^t and white people=40000(0.992)^t.At least how many years dpes it take for number of black people to exceed white people ?
回答 (1)
2011-09-01 7:37 am
✔ 最佳答案
25000(1.005)^t > 40000(0.992)^t1.0131^t > 1.6
tlog(1.0131) > log(1.6)
t > 36.1
So, at least 37 years dpes it take for number of black people to exceed white people
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110831000051KK01358