1 the sum of two numbers, x and y, equals twice their products. if x=3, what is the value of y?
2 if x is an integer and x2(x的平方)<37,what is the greatest possible value of x minus the least possible value of x?
a.5 b.6 c.10 d.12 e.36
3 三角形ABC，角B=X度，X>90 度，比较三角形的周长与3倍AC的长度的大小，答案是B
比较the greatest value of p(1-p)与1/2的大小，答案是C
答案错了,选B p+(1-p)>=2p(1-p)^1/2 => p(1-p)<=1/4 < 1/2
4 for the line with equation y=ax+b,the x-intercept os twice the y-intercept
比较the slope of the line 与1/2的大小，答案是D，但算出来是-1/2呀
5 a certain moneymarket account that had a balance of $48000 during all of last monthearned $360 in interest for the month. at what simple annual interestrate did the account earn interest last month?
6 Of the positive integers that are multiples of 30 and are less than or equal to 360,what fraction are multiples of 12?
a.1/6 b.1/5 c.1/3 d.2/5 e.1/2
首先这道题我是对multilples of ....不大明白,这是什么意思啊?其次这道题怎么解呢?
7 A certain teacher has a total ofat least 110 students enrolled in her classes.if the teachers has anaverage (arithmetic mean) of exactly 27 students enrolled per class.what is the least possible number of classes that the teacher couldhave?
a.3 b.4 c.5 d.6 e.7
8 a delivery service charges $0.02 per ounce for the first 16 ounces ofa shipment and $0.15 for each additional ounce of theshipment,(1pound=16ounce)
the delivery charges for x shipments weighing a combimed total of the pounds vs 567.00
9 the cost per gram of carrots if 3 cans of carrots cost $0.90 the costper gram of onions if 5 cans of onions cost $1.50
10 X is an integer, and the remainder when 2X is divided by 4 is 0.
The remainder when X is divided by 4 0