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SAT官方每日一题附答案和解析[数学](2018年2月24日)
日期:2018-02-24 10:36

(单词翻译:单击)

每日一题

Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

Scarlett is studying the neurology of mice. One article she reads suggests that the number of neurons a mouse has, N(t), after t months is modeled by the function N(t)=N0*(1-r)^(t/τ), where N0 is the initial number of neurons at time t=0, r is a rate where 0<r <1, and τ, measured in months, is a constant. If τ is 4 months, which of the following statements would best describe the relationship between the number of neurons and the number of months t that have passed since N0 was measured?

A.The number of neurons decreases by a fixed amount every 4 months.
B.The number of neurons remaining increases by a fixed amount every 4 months.
C.The number of neurons decreases by an amount proportional to the decrease in the previous 4 months.
D.The number of neurons increases by an amount proportional to the increase in the previous 4 months.

答案和解析

答案:C

解析:

Choice C is correct.

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