急问几道PREP数学

160.  16619-!-item-!-187;#058&011092

An automobile manufacturer offers a station wagon with either a 6-cylinder engine or a 4-cylinder engine and with either a manual transmission or an automatic transmission.  A trailer hitch is also offered, but only on a station wagon with a 6-cylinder engine.  How many combinations of the five options listed does the manufacturer offer for its station wagon?

(A) 3

(B) 4

(C) 5

(D) 6

(E) 8

162.  17416-!-item-!-187;#058&011441

If x is an odd integer, which of the following is also an odd integer?

(A) 2x

(B) 4x + 2

(C) x2 + 3

(D) x2 + x + 3

(E) x2 + 2x + 1

166.  17879-!-item-!-187;#058&011634

70, 75, 80, 85, 90, 105, 105, 130, 130, 130

The list shown consists of the times, in seconds, that it took each of 10 schoolchildren to run a distance of 400 meters.  If the standard deviation of the 10 running times is 22.4 seconds, rounded to the nearest tenth of a second, how many of the 10 running times are more than 1 standard deviation below the mean of the 10 running times?

(A) One

(B) Two

(C) Three

(D) Four

(E) Five

171.  18385-!-item-!-187;#058&011883

Lynn lent Robert $10,000 at 6 percent simple annual interest to be repaid at the end of 3 years.  What was the total amount that Robert had to pay to Lynn?

(A) $10,180

(B) $10,190

(C) $10,600

(D) $11,800

(E) $11,910

138.  13412-!-item-!-187;#058&010022

A grocer stacked oranges in a pile.  The bottom layer was rectangular with 3 rows of 5 oranges each.  In the second layer from the bottom, each orange rested on 4 oranges from the bottom layer, and in the third layer, each orange rested on 4 oranges from the second layer.  Which of the following is the maximum number of oranges that could have been in the third layer?

(A) 5

(B) 4

(C) 3

(D) 2

(E) 1

160:那个also offered的不是肯定会出现在6c上面的，也就是有6-m-t，6-a-t，6-m，6-a，4-m，4-a六种组合

162：式子可以变成(x+1)^2-(x-2),x是奇数，前面的平方就是偶数，后面的括号是奇数，偶数减去奇数等与奇数

166：是不是没有读懂题目啊....题目给了10个成绩，给了这10个成绩近似到十分位的标准差，问这十个成绩中，与这是个成绩的平均值相差超过一个标准差的有多少个....平均值是100，十个成绩中加上标准差小于一百的只有前面两个..

171:simple annual interest是单利，利息就是100000*0.06*3

最后一题：意思就是每四个橘子组成的小矩形中间摆一个橘子，那么倒数第二层就能够放8个，倒数第三层放3个

138：