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SAT官方每日一題附答案和解析[數學](2020年6月10日)

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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.

重點單詞   查看全部解釋    
initial [i'niʃəl]

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n. (詞)首字母
adj. 開始的,最初的,

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measured ['meʒəd]

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adj. 量過的,慎重的,基于標準的,有韻律的 動詞me

 
neurology [njuə'rɔlədʒi]

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n. 神經學,神經病學

 
multiple ['mʌltipl]

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adj. 許多,多種多樣的
n. 倍數,并聯

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constant ['kɔnstənt]

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adj. 經常的,不變的
n. 常數,恒量

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previous ['pri:vjəs]

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adj. 在 ... 之前,先,前,以前的

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describe [dis'kraib]

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vt. 描述,畫(尤指幾何圖形),說成

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function ['fʌŋkʃən]

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n. 功能,函數,職務,重大聚會
vi. 運行

 
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