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OG18-语文分册
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Which of the following, if true, most strengthens the author's assertion in the first sentence of the second paragraph?
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OG18-数学分册
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A certain population of bacteria doubles every 10 minutes. If the number of bacteria in the population initially was $${10}^4$$, what was the number in the population 1 hour later?
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OG18 OG19 OG20 OG2022
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Kevin invested $8,000 for one year at a simple annual interest rate of 6 percent and invested $10,000 for one year at an annual interest rate of 8 percent compounded semiannually. What is the total amount of interest that Kevin earned on the two investments?
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OG18
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If $$(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6}) = r(\frac{1}{9}+\frac{1}{12}+\frac{1}{15}+\frac{1}{18})$$, then r =
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OG18 OG19 OG20 OG2022
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If k is a positive integer, what is the remainder when $$(k + 2)({k}^{3} – k)$$ is divided by 6 ?
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OG18 OG19 OG20 OG2022
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Three printing presses, R, S, and T, working together at their respective constant rates, can do a certain printing job in 4 hours. S and T, working together at their respective constant rates, can do the same job in 5 hours. How many hours would it take R, working alone at its constant rate, to do the same job?
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OG18 OG19 OG20 OG2022
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 The table above gives the age categories of the 161 employees at Company X and the number of employees in each category. According to the table, if m is the median age, in years, of the employees at Company X, then m must satisfy which of the following ?
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OG18 OG19 OG20 OG2022
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Clarissa will create her summer reading list by randomly choosing 4 books from the 10 books approved for summer reading. She will list the books in the order in which they are chosen. How many different lists are possible?
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OG18-数学分册
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What is the value of xy?(1) x + y = 10(2) x - y = 6
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OG18-数学分册
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A window is in the shape of a regular hexagon with each side of length 80 centimeters. If a diagonal through the center of the hexagon is w centimeters long, then w =
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OG18-数学分册
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A couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys?
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OG18-数学分册
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The subsets of the set {w, x, y} are {w}, {x}, {y}, {w, x}, {w, y}, {x, y}, {w, x, y}, and { } (the empty subset). How many subsets of the set {w, x, y, z} contain w ?
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OG18-数学分册
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$${2\frac{3}{5}-1\frac{2}{3}}\over{\frac{2}{3}-\frac{3}{5}}$$=
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OG18-数学分册
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The number $$\sqrt{63-36\sqrt{3}}$$ can be expressed as $$x + y \sqrt{3} $$ for some integers x and y. What is the value of xy
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OG18-数学分册
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 In the figure above, point O is the center of the circle and OC = AC = AB. What is the value of x?
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OG18-数学分册
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In a certain medical survey, 45 percent of the people surveyed had the type A antigen in their blood and 3 percent had both the type A antigen and the type B antigen. Which of the following is closest to the percent of those with the type A antigen who also had the type B antigen?
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OG18-数学分册
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 If the variables X, Y, and Z take on only the values 10, 20, 30, 40, 50, 60, or 70 with frequencies indicated by the shaded regions above, for which of the frequency distributions is the mean equal to the median?
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OG18-数学分册
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If x + y + z > 0, is z >1?(1) z > x + y + 1(2) x + y +1 < 0
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OG18-数学分册
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If w + z = 28, what is the value of wz?(1) w and z are positive integers(2) w and z are consecutive odd integers
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OG18-数学分册
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What was the amount of money donated to a certain charity?(1) Of the amount donated, 40 percent came from corporate donations.(2) Of the amount donated, $1.5 million came from noncorporate donations.
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