请斑竹帮忙:
97年4月:
section2:
9.x and y each represent single digits in the decimal 4.3xy8. When the decimal is rounded to the nearest hundredth, the result is 4.36.
x 5
题目什么意思啊?涉及到小数的问题都不理解。。。
13. P,Q and R are distinct points on a straight line, with Q between P and R, S is a point not on the line, and QR = QS
PR PS
觉得是B,答案是A
16. Diane completed each of her exercise sets in 75 seconds and rested for 55 seconds between the exercise sets. What is the ratio of the amount of time it took her to complete an exercise set to the amount of time she rested between the sets?
(A) 5:6
(B) 5:11
(C) 6:11
(D) 11:5
(E) 11:6
不是75:55么?
section5:
21-25的图表大题中24.At a wind speed of 30 miles per hour, it the actual temperature increases by to degrees Fahrenheit then the apparent temperature increases by approximately how many degrees Fahrenheit?
(A) 5
(B) 7
(C) 10
(D) 15
(E) 20
题目不懂。
30. A certain money market account that had a balance of $48,000 during all of last month earned $360 in interest for the month. At what simple annual interest rate did the account earn interest last month?
(A) 7%
(B) 7.5%
(C) 8%
(D) 8.5%
(E) 9%
题目不懂,不会算。
97年11月section5:
27. In a graduating class of 236 students, 142 took
algebra and 121 took chemistry. What is the
greatest number of students that could have
taken both algebra and chemistry?
(A) 21 (B) 27 (C) 37 (D) 121 (E) 142
我觉得是B,答案是D,为什么?
28. If one number is chosen at random from the first
1,000 positive integers, what is the probability
that the number chosen is multiple of both 2 and
8?
怎么算啊?答案是1/8.
万分感谢!
The numbers in a table are arranged in 10 rows and 4 columns such that one number is placed at the intersection of each row and column, How many numbers are contained in the table?
就是问行与列间隔中能放几个数倍?我怎么算的30呢?因为4个数有3个空呀~