1. Which of the following CANNOT yield an integer when divided by 10?
A. The sum of two odd integers
B. An integer less than 10
C. The product of 2 primes
D. The sum of 3 consecutive integers
E. An odd integer
2.On a certain road, 10 persent of the motorists exceed the posted speed limit and receive speeding tickets, but 20 percent of the motorists who exceed the posted speed limit do not receive speeding tickets. What percent of the motorists on that road exceed the posted speed limit?
A.10.5 B 12.5% C15% D22% E 30%
3.A certain clock marks every hour by striking a number of times equal to the hour and the time interval between strokes. At 6:00 the time lapse between the beginning of the first stroke and the end of he last stroke is 22 seconds. At 12:00, how many seconds elapse between the beginning of the first stroke and the end of the last stroke?
A,72 B,50 C,48 D46 E,44
4.A store currently charges the same price for each towel that it sells. If the current price of each towel were to be increased by $1, 10 fewer of the towel could be bought for $120, excluding sales tax. What is the current price of each towel?
A,$1 B,$2 C,$3 D$4 E$12
If z^n=1, what is the valus of z?
(1)n is a nonzero integer (2)z>0
5. New theories propose that catastrophic impacts of asteroid and comets may have caused reversal in the Earth’s magnetic field, the onset of ice ages, (splitting apart continents) 80 million years ago, and great volcanic eruptions.
A, B, the splitting apart of continents
C,split apart continents D,continents split apart E,continents that were split apart作者: tongxun 时间: 2002-8-31 21:37
1\ e.
2\ 0.8a=0.1b
3\ 3 dollars
? 1)z=1 or -1,because n=odd or even 2)z>0 but n is not specified.For example, n=0 1)+2)----z=1
5\ B.作者: tarzan 时间: 2002-9-1 07:38
Can you explain these problems? thanks
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