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R, S, T, and U are points on a line, and U is the midpoint of line segment ST. If the lengths of line segments RS, RT, and ST are 20, 4, and 24, respectively. What is the length of line segment RU?
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M = {-6, -5, -4, -3, -2}T = {-2, -1, 0, 1, 2, 3}If an integer is to be randomly selected from set M above and an integer is to be randomly selected from set T above, what is the probability that the product of the two integers will be negative?
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OG18-数学分册
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A certain company that sells only cars and trucks reported that revenues from car sales in 1997 were down 11 percent from 1996 and revenues from truck sales in 1997 were up 7 percent from 1996. If total revenues from car sales and truck sales in 1997 were up 1 percent from 1996, what is the ratio of revenue from car sales in 1996 to revenue from truck sales in 1996?
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The number of defects in the first five cars to come through a new production line are 9, 7, 10, 4, and 6, respectively. If the sixth car through the production line has either 3, 7, or 12 defects, for which of theses values does the mean number of defects per car for the first six cars equal the median?I.3II.7III.12
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 Note:Figure not drawn to scale.On line segment AD shown, $$AB=\frac1 2CD$$ and BC = 10. If AD = 100, then CD =
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OG18-数学分册
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At a garage sale, all of the prices of the items sold were different. If the price of a radio sold at the garage sale was both the 15th highest price and the 20th lowest price among the prices of the items sold, how many items were sold at the garage sale?
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排列组合
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From a group of 3 boys and 3 girls, 4 children are to be randomly selected. What is the probability that equal numbers of boys and girls will be selected?
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A certain machine produces 1,000 units of product P per hour. Working continuously at this constant rate, this machine will produce how many units of product P in 7 days?
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代数
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If x < 0 and 0 < y < 1, which of the following has the greatest value?
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 According to the table above, what was the total number of watts of electricity used for the four appliances in the household on May 1?
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几何
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In the xy-plane, the point (-2, -3) is the center of a circle. The point (-2, 1) lies inside the circle and the point (4, -3) lies outside the circle. If the radius r of the circle is an integer, then r =
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If $$xyz > 0$$, is $${x}{y}^{2}{z}^{3} < 0$$ ?(1)$$y < 0$$(2)$$x > 0$$
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What was the percent increase in the average (arithmetic mean) contribution per member of a certain public radio station from 1985 to 1995 ?(1)Total contributions by members increased from $505,210 in 1985 to $1,225,890 in 1995.(2)The number of members exactly doubled from 1985 to 1995.
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 In the figure shown, triangle ABC is inscribed in the circle. What is the circumference of the circle?(1)AB is a diameter of the circle.(2)The ratio of the lengths of BC, AC, and AB, respectively, is 3 : 4 : 5.
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What is the value of $${x}^{2}$$ ?(1)$${5}<{x}^{2}<{10}$$(2)x is an integer.
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If x and y are positive, is $$x^{3}\gt{y}$$?
(1)$$\sqrt{x}\gt{y}$$(2)$$x\gt{y}$$
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If |n+5|= 5, what is the value of n?(1)n^2 is not equal to 0.(2)n^2 + 10n = 0
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PREP07 Test 1
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An integer greater than 1 that is not prime is called composite. If the two-digit integer n is greater than 20, is n composite?(1)The tens digit of n is a factor of the units digit of n.(2)The tens digit of n is 2.
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OG18-数学分册
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A grocer has 400 pounds of coffee in stock, 20 percent of which is decaffeinated. If the grocer buys another 100 pounds of coffee of which 60 percent is decaffeinated, what percent, by weight, of the grocer's stock of coffee is decaffeinated?
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If the population of a certain country is 120,256,000 and its land area is 2,998,000 square kilometers, then the population per square kilometer is closest to which of the following?
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