1.There are 4 card-processing machines in an office. The fastest of these machines processes x cards in 7 hours and the slowest processes x cards in 8 hours. Which of the following cound Not be the average time per machine for each of the 4 machines to process x cards?1)7.2 2)7.3 3)7.5 4)7.6 5)7.7
my answer is 7.25--7.75, so here we choose 1
2.if a taxi driver charges x cents for the first quarter-mile of a trip and x/5 cents for each additional quarter-mile, what is the charge, in cents, for a trip whose distance in miles is the whole number y? a.(x+sy)/125 b.( 4x+4xy)/5 c. (4x+xy)/500 d. (4x+xy)/5 e. xy/25
my method: x+(y-1/4)/(1/4)*(x/5)=b
3.In the figure above, two searchlights S1 and S2 are located 10,000 feet apart; each covers an area of radius 10,000 feet, and each is located 8,000 feet from the railroad track. To the nearest 1,000 feet, what is the total length x of track spanned by the searchlights? a. 24,000 b.22,000 c.20,000 d.16,000 e. 12,000
the figure as follows:
[upload=jpg]uploadImages/20029241617187443.jpg[/upload]作者: tongxun 时间: 2002-9-24 17:37
each covers an area of radius 10,000 feet, and each is located 8,000 feet from the railroad track. To the nearest 1,000 feet
按照你的解法，上述条件前2个构成了直角三角形，所以底边为6，000，可是to the nearest 1,000feet在这里什么意思？为什么跟它没有关系？作者: tongxun 时间: 2002-9-24 23:03
我的算法中底边是12，000。我没用到“to the nearest 1,000feet”这个条件。
答案对吗？作者: brigittew 时间: 2002-9-25 16:43
我看了，答案是对的
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