# SAT官方每日一題附答案和解析[數學](2020年6月10日)  評論 打印 收藏本文

Mathematics>Standard Multiple Choice

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] 想一想再看 n. (詞)首字母adj. 開始的，最初的， 聯想記憶 measured ['meʒəd] 想一想再看 adj. 量過的，慎重的，基于標準的，有韻律的 動詞me neurology [njuə'rɔlədʒi] 想一想再看 n. 神經學，神經病學 multiple ['mʌltipl] 想一想再看 adj. 許多，多種多樣的n. 倍數，并聯 聯想記憶 constant ['kɔnstənt] 想一想再看 adj. 經常的，不變的n. 常數，恒量 聯想記憶 previous ['pri:vjəs] 想一想再看 adj. 在 ... 之前，先，前，以前的 聯想記憶 describe [dis'kraib] 想一想再看 vt. 描述，畫(尤指幾何圖形)，說成 聯想記憶 function ['fʌŋkʃən] 想一想再看 n. 功能，函數，職務，重大聚會vi. 運行
? # 可可英語官方微信(微信號:ikekenet)

每天向大家推送短小精悍的英語學習資料. 添加方式1.掃描上方可可官方微信二維碼。
添加方式2.搜索微信號ikekenet添加即可。 尊龙游戏平台 - 官方平台