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OG18 OG19 OG20 OG2022
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If x (2x + 1) = 0 and (x + $$\frac{1}{2}$$)(2x - 3) = 0, then x =
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OG18 OG19 OG20 OG2022
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For the positive integers a, b, and k, $$a^{k}$$ || b means that $$a^{k}$$ is a divisor of b, but $$a^{k +1}$$ is not a divisor of b. If k is a positive integer and $$2^{k}$$ || 72, then k is equal to
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OG18-数学分册
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If $$x^{2} = 2^{x}$$, what is the value of x?(1) $$2x = ({\frac{x}{2}})^{3}$$(2) $$x = {2}^{x -2}$$
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OG18-语文分册 OG19-语文分册 OG20-语文分册
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Even though the overall consumer price index did not change in April, indicating the absence of any general inflation or deflation, prices in several categories of merchandise have fallen over the last several months.
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OG18-语文分册 OG19-语文分册 OG20-语文分册
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Early administrative decisions in China's Ming Dynasty eventually caused a drastic fall in tax revenues, a reduction in military preparedness, the collapse of the currency system, and failed to make sufficient investment in vital transportation infrastructure.
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OG18-语文分册 OG19-语文分册 OG20-语文分册
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The North American moose's long legs enable it to move quickly through the woods, stepping easily over downed trees, but predators pursuing it must leap or go around them.
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OG18-语文分册 OG19-语文分册 OG20-语文分册
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Sor Juana Inés de la Cruz was making the case for women's equality long before the cause had a name: Born in the mid-seventeenth century in San Miguel Nepantla, Mexico, the convent was the perfect environment for Sor Juana to pursue intellectual pursuits, achieving renown as a mathematician, poet, philosopher, and playwright.
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OG18-语文分册 OG19-语文分册 OG20-语文分册
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Less than 400 Sumatran rhinos survive on the Malay peninsula and on the islands of Sumatra and Borneo, and they occupy a small fraction of the species' former range.
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OG18-语文分册 OG19-语文分册 OG20-语文分册
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Unable to build nests or care for their young, a female cowbird lays up to 40 eggs a year in the nests of other birds, including warblers, vireos, flycatchers, and thrushes.
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OG18-语文分册 OG19-语文分册 OG20-语文分册
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Carbon dioxide, which traps heat in the atmosphere and helps regulate the planet's surface temperature, is constantly being exchanged between the atmosphere on the one hand and the oceans and terrestrial plants on the other.
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OG18-语文分册 OG19-语文分册 OG20-语文分册
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Around 1900, fishermen in the Chesapeake Bay area landed more than seventeen million pounds of shad in a single year, but by 1920, overfishing and the proliferation of milldams and culverts that have blocked shad migrations up their spawning streams had reduced landings to less than four million pounds.
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OG18-语文分册
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The passage suggests that, in the early 1990s, Michaels would have been most likely to agree with which of the following statements about the disparity mentioned ?
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In a 1918 editorial, W.E.B. Du Bois advised African Americans to stop agitating for equality and to proclaim their solidarity with White Americans for the duration of the First World War. The editorial surprised many African Americans who viewed Du Bois as an uncompromising African American leader and a chief opponent of the accommodationist tactics urged by Booker, T.Washington. In fact, however, Du Bois often shifted positions along the continuum between Washington and confrontationists such as William Trotter. In 1895, when Washington called on African Americans to concentrate on improving their communities instead of opposing discrimination and agitating for political rights, Du Bois praised Washington's speech. In 1903, however, Du Bois aligned himself with Trotter, Washington's militant opponent, less for ideological reasons than because Trotter had described to him Washington's efforts to silence those in the African American press who opposed Washington's positions.Du Bois's wartime position thus reflected not a change in his long-term goals but rather a pragmatic response in the face of social pressure: government officials had threatened African American journalists with censorship if they continued to voice grievances. Furthermore, Du Bois believed that African Americans' contributions to past war efforts had brought them some legal and political advances. Du Bois' accommodationism did not last, however. Upon learning of systematic discrimination experienced by African Americans in the military, he called on them to "return fighting" from the war.
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OG18-数学分册
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If the set S consists of five consecutive positive integers, what is the sum of these five integers?(1) The integer 11 is in S , but 10 is not in S.(2) The sum of the even integers in S is 26.
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OG18-数学分册
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Two numbers differ by 2 and sum to S. Which of the following is the greater of the numbers in terms of S ?
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OG18-数学分册
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 When the figure above is cut along the solid lines, folded along the dashed lines, and taped along the solid lines, the result is a model of a geometric solid. This geometric solid consists of 2 pyramids, each with a square base that they share. What is the sum of the number of edges and the number of faces of this geometric solid?
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OG18-数学分册
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An airline passenger is planning a trip involves three connecting flight that leave from Airports A, B, and C, respectively. The first flight leaves Airport A every hour, beginning at 8:00 a.m., and arrives at Airport B $$2\frac{1}{2}$$hours later. The second flight leaves Airport B every 20 minutes , beginning at 8:00 a.m.,and arrives at Airport C $$1\frac{1}{6}$$ hours later. The third flight leaves Airpoort C every hour, beginning at 8:45 a.m. What is the least total amount of time the passenger must spend between flights if all flights keep to their schedules?
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OG18-数学分册
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In a numerical table with 10 rows and 10 columns, each entry is either a 9 or a 10. If the number of 9s in the nth row is n – 1 for each n from 1 to 10, what is the average (arithmetic mean) of all the numbers in the table?
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OG18-数学分册
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 In the figure shown, PQRSTU is a regular polygon with sides of length x. What is the perimeter of triangle PRT in terms of x?
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OG18-数学分册
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A survey of employers found that during 1993 employment costs rose 3.5 percent, where employment costs consist of salary costs and fringe-benefit costs. If salary costs rose 3 percent and fringe-benefit costs rose 5.5 percent during 1993, then fringe-benefit costs represented what percent of employment costs at the beginning of 1993 ?
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