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OG18-数学分册
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$$3r \leq 4s + 5$$$$|s| \leq 5$$Given the inequalities above, which of the following CANNOT be the value of r ?
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OG18-数学分册
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If m is an even integer, v is an odd integer, and m > v > 0, which of the following represents the number of even integers less than m and greater than v ?
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OG18-数学分册
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A positive integer is divisible by 9 if and only if the sum of its digits is divisible by 9. If n is a positive integer, for which of the following values of k is $$25 * 10^{n} + k * 10^{2n} divisible by 9 ?$$
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OG18-数学分册 OG19-数学分册
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The perimeter of rectangle A is 200 meters. The length of rectangle B is 10 meters less than the length of rectangle A and the width of rectangle B is 10 meters more than the width of rectangle A. If rectangle B is a square, what is the width, in meters, of rectangle A ?
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OG18-数学分册
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On the number line, the shaded interval is the graph of which of the following inequalities?
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OG18-数学分册
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Of all the students in a certain dormitory, $$\frac1 2$$ are first-year students and the rest are second-year students. If $$\frac4 5$$ of the first-year students have not declared a major and if the fraction of second-year students who have declared a major is 3 times the fraction of first-year students who have declared a major, what fraction of all the students in the dormitory are second-year students who have not declared a major?
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OG18-数学分册
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If the average (arithmetic mean) of x, y, and z is 7x and x ≠ 0, what is the ratio of x to the sum of y and z ?
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OG18-数学分册
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$${(- 1.5)(1.2) - (4.5)(0.4)}\over{30} $$ =
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OG18-数学分册
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In the coordinate plane, line k passes through the origin and has slope 2. If points (3,y) and (x,4) are on line k, then x + y =
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OG18-数学分册 OG19-数学分册
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If a, b, and c are constants, a > b > c, and $$x^{3} ‒ x = (x ‒ a)(x ‒ b)(x ‒ c)$$ for all numbers x, what is the value of b ?
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OG18-数学分册
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Company K's earnings were $12 million last year. If this year's earnings are projected to be 150 percent greater than last year's earnings, what are Company K's projected earnings this year?
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OG18-数学分册
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$$17^{3} + 17^{4} = $$
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OG18-数学分册
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Jonah drove the first half of a 100-mile trip in x hours and the second half in y hours. Which of the following is equal to Jonah's average speed, in miles per hour, for the entire trip?
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OG18-数学分册
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What is the greatest number of identical bouquets that can be made out of 21 white and 91 red tulips if no flowers are to be left out? (Two bouquets are identical whenever the number of red tulips in the two bouquets is equal and the number of white tulips in the two bouquets is equal.)
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OG18-数学分册
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In the xy-plane, the points (c,d), (c,–d), and (–c,–d) are three vertices of a certain square. If c < 0 and d > 0, which of the following points is in the same quadrant as the fourth vertex of the square?
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OG18-数学分册
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For all numbers s and t, the operation * is defined by s * t =(s - 1)(t +1). If (- 2)* x = - 12, then x =
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OG18-数学分册
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If the amount of federal estate tax due on an estate valued at $1.35 million is $437,000 plus 43 percent of the value of the estate in excess of $1.25 million, then the federal tax due is approximately what percent of the value of the estate?
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OG18-数学分册
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If $$\frac{3}{10^{4}}$$ = x%, then x =
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OG18-数学分册
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If a basketball team scores an average (arithmetic mean) of x points per game for n games and then scores y points in its next game, what is the team's average score for the n + 1 games?
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OG18-数学分册
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At a certain pizzeria,$$\frac{1}{8}$$ of the pizzas sold in one week were mushroom and $$\frac{1}{3} $$ of the remaining pizzas sold were pepperoni. If n of the pizzas sold were pepperoni, how many were mushroom?
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