请指教啊,多谢!
33.
If x^4 + y^4 = 100, then the greatest possible value of x is between B
(A) 0 and 3
(B) 3 and 6
(C) 6 and 9
(D) 9 and 12
(E) 12 and 15
16.
Lines n and p lie in the xy-plane.
Is the slope of line n less than the slope of line p ?C
(1)Lines n and p intersect at the point (5,1).
(2)The y-intercept of line n is greater than the y-intercept of line p.
34.
During an experiment, some water was removed from each of 6 water tanks.
If the standard deviation of the volumes of water in the tanks at the beginning of the experiment was 10 gallons, what was the standard deviation of the volumes of water in the tanks at the end of the experiment? A
(1) For each tank, 30 percent of the volume of water that was in the tank at the beginning of the experiment was removed during the experiment.
(2) The average (arithmetic mean) volume of water in the tanks at the end of the experiment was 63 gallons.
42.
John and Mary own shares of stock in a certain company.
Does John own more shares of the company's stock than Mary? C
(1) Mary owns more than 500 shares of the company's stock.
(2) The number of shares of the company's stock that John owns is 400 less than twice the number of shares of the company's stock that Mary owns.
45.
How many of the 42 people in a group are employed students? E
(1) 29 of the 42 people are employed.
(2) 24 of the 42 people are students.
52.
If the average (arithmetic mean) of four different numbers is 30, how many of the numbers are greater than 30 ? C
(1) None of the four numbers is greater than 60.
(2) Two of the four numbers are 9 and 10, respectively.
64.
Are at least 10 percent of the people in Country X who are 65 years old or older employed? B
(1) In Country X, 11.3 percent of the population is 65 years old or older.
(2) In Country X, of the population 65 years old or older, 20 percent of the men and 10 percent of the women are employed.
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发表于 2009-1-12 17:43:00
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