求问几道数学题

liyanleiUID: 2958751

纠结好几天了，有的是图标题，我先把题干打出来吧。望哪位大牛麻烦帮忙看下吧。多谢啦，祝好人一生平安
1）黄皮书SECTION65，第24题，
for the categories given, which category accounts for approximately 1/4 of the total number of graduates expected for each of the years shown?
A high school diploma    B associate degree      C  bacherlor's degree    D master's degree    E  doctoral degree

2）section 66     24题
from 1950 to 1985, the population of country X increased by approximately how many million people?
A  45    B 80       C  165    D  200    E...

3) SECTION 66   26题
给了一个正方形，其中对角线相连，其中有四分之一的阴影面积
题目是：If the area of the shaded region of the square above is 20. what is the perimeter of the square?
A   45    B  85    C   165   D  80    E  400
这题死活没算出来165

4）SECTION 66  27题
给了两个方程  Feight train  -10t+115;  passenger train   -20t+115
题目： the expressions in the table above give the distance of each of the two trains from C at t hours after 12:00 noon, at what time will the trains be equaidiatant for C.
A 1:30PM    B  3:30PM   C  5:10PM     D  8:50PM      E  11:30 PM

5) SECTION 66   29题
给了一个正方形， 中间有三个圆，题目：
IF each shaded circular region in the figure above has radius 5, then the area of the shaded regions is what fraction of the area of the square region?
A  Pai/12    B pai/36    C pai/60    D 1/6   E  1/3

6) if n=pqr, where p, q, r are three different positive prime numbers, how many different positive divisiors does N have, including 1 and N
A  3           B  5        C 6          D  7             E  8
我觉得是5个，答案8

7) SECTION 67  21题(又是图表题)
when compared with the transaction fee for a $1000 cash advance, the transaction fee for a $500 cash advance is
答案是C: the same, 算不出来

8）与7同一图表，问： which of the following cash advance amounts is the transacion fee approximately $4?
也是怎么都算不出来$190

惭愧，那么多不会的。好纠结！！求好心人

liyanleiUID: 2958751

自己顶一个！！！！

liyanleiUID: 2958751

大家都睡啦？！！！！
期待明天又人来答

liyanleiUID: 2958751

大家都睡啦？！！！！
期待明天又人来答

doraliuUID: 2842061

表示。。。昨天刚做过
7  500*0.02=1000*0.01 the same
8 方法比较愚蠢 (2%-1%)/(500-1000)(x-500)=y-2% 求xy=4的点。。。。可以猜出A来吧
6  p q r qp qr pr 1 n共8个
5 3*pai*5*5/30*30=pai/12吧 记不得很清楚了
4  -10t+115 =-20t+150 吧我记得 t=3.5就是3个半小时，下午3点半是答案
1，本科生人数/所有人数=大概1/4啊

不知道2，3是什么题目了

hua11UID: 3027785

补充楼上
2、1950年人口=2*13.1=26.2 millions；1985人口=3.3*40=132 millions；132-26.2=105.8.
貌似没这个选项

3、由题意知正方形的面积为80，那么边长为4*sqrt(5)，那么周长为16*sqrt(5)。难不成C的根号印刷漏了么

yuanmountainUID: 3156578

第5题怎么会有30*30