新SAT官方Daily Practise每日一题数学代数题

小站教育2017-06-27 11:25:48

5227

问题相似？试试立即获取解答吧~

摘要：今天起，本系列将给大家带来SAT官方的每日一练真题，各个项目都有，持续更新，希望大家同步多练习。今天这里分享的是6月23日的数学代数题，一起来练习吧！

Each year from 2007 to 2015, a group of people were selected at random and surveyed about their use of online radio. The survey asked respondents whether or not they listened to online radio in the last month. The scatter plot shown gives the results of the survey, where P represents the percent of respondents who reported listening to online radio and t represents years since 2007.Which of the following equations best models the relationship between t and P?

6月官方Daily Practice 每日一练数学，点击进入

SAT官方每日一题附答案和解析[数学](2017年6月27日)

A.P=0.23t+18

B.P=t+20

C.P=2.3t+20

D.P=4.3t+18

重点单词：

slope [sləup] n. 倾斜，斜坡，斜面，斜线，斜率

survey [sə:'vei] v. 调查，检查，测量，勘定，纵览，环视

multiple ['mʌltipl] adj. 许多，多种多样的

random ['rændəm] adj. 随机的，随意的，任意的

答案：D

解析：

Choice D is correct. Drawing a best fit line on the scatter plot helps to estimate the slope and y-intercept, or in this case, the P-intercept of the line.

According to the line, the P-intercept is about (0,18)and the slope is greater than 4 but less than 6.

Therefore, of the equations given, P=4.3t+18 is the best model of the relationship between t and P.

下载小站SAT APP，刷SAT真题