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191222 $$K=1+2+2^2+2^3+....+2^n$$，n=9, what is the value of K?
191222 还原机经选题: 数论&代数 Is x an integer?
1: 5x is an integer
2: The reciprocal of x is an integer
191222 There is a six-digit integer: 495372. If two numbers are exchanged with each other, is the new number n larger than 495372？
(1)3 is a factor of n
(2)4 is a factor of n
191222 Is x>0 ？
1：2^|x|=2^x
2：3^|x|≥3^x
191222 730高分节-数学测试 $$x_1$$, $$x_2$$, …, $$x_n$$，$$x_1$$=3，$$x_n=2 x_{n-1}-1$$，问$$x_{20}-x_{19} = $$
191222 There are 90 people who learn either A or G， 15% learn both，the number of people who learn A is two times as many as those who learn B，How many people who learn A ONLY？
191222
Now there is a coordinate system, and it is known that the coordinates of the two points are D (8, -2) and B (2,4). What is the coordinate of the intersection point of the vertical bisector of the DB and the x axis?
191222 There are red, green, white balls in a jar, with a number of 25 in total. What is the number of red balls?
(1)The number of red balls is one less than the sum of the number of green balls and white balls
(2)The number of red balls is three times the number of green balls
191222 A has x apples and B has y apples; when A gives B 6 apples, A has as many apples as B; when B gives A 6 apples, A has twice as many apples as B. How many apples does A and B have in total?
If 0
What is the greatest integer that is less than: -|3½-3|?
Of the apartments in a certain building, 75 have a balcony, 80 have a fireplace, and 30 have neither a balcony nor a fire place. How many of the apartments in the building that have a balcony do not have a fireplace? (1) There is a total of 150 apartments in the building. (2) 35 of the apartments in the building that have a balcony also have a fireplace.
Ethnohistoric documents from sixteenth-century Mexico suggesting that weaving and cooking were the most common productive activities for Aztec women may lead modern historians to underestimate the value of women's contributions to Aztec society. Since weaving and cooking occurred mostly (but not entirely) in a domestic setting, modern historians are likely to apply to the Aztec culture the modern Western distinction between "private" and "public" production. Thus, the ethnohistoric record conspires with Western culture to foster the view that women's production was not central to the demographic, economic, and political structures in sixteenth-century Mexico. A closer examination of Aztec culture indicates that treating Aztec women's production in Mexico in such a manner would be a mistake. Even if the products of women's labor did not circulate beyond the household, such products were essential to population growth. Researchers document a tenfold increase in the population of the valley of Mexico during the previous four centuries, an increase that was crucial to the developing Aztec political economy. Population growth - which could not have occurred in the absence of successful household economy, in which women's work was essential - made possible the large-scale development of labor-intensive chinampa (ridged-field) agriculture in the southern valley of Mexico which, in turn, supported urbanization and political centralization in the Aztec capital. But the products of women's labor did in fact circulate beyond the household. Aztec women wove cloth, and cloth circulated through the market system, the tribute system, and the redistributive economy of the palaces. Cotton mantles served as a unit of currency in the regional market system. Quantities of woven mantles, loincloths, blouses, and skirts were paid as tribute to local lords and to imperial tax stewards and were distributed to ritual and administrative personnel, craft specialists, warriors, and other faithful servants of the state. In addition, woven articles of clothing served as markers of social status and clothing fulfilled a symbolic function in political negotiation. The cloth that was the product of women's work thus was crucial as a primary means of organizing the flow of goods and services that sustained the Aztec state.
The author of the passage would be most likely to agree with which of the following statements about the documents mentioned in the first sentence of the passage?
The author of the passage is primarily concerned with doing which of the following?
Until recently,  zoologists believed that all species of phocids (true seals), a pinniped family, use a different maternal strategy than do otariids (fur seals and sea lions), another pinniped family.  Mother otariids use a foraging strategy. They acquire moderate energy stores in the form of blubber before arriving at breeding sites and then fast for 5 to 11 days after birth. Throughout the rest of the lactation (milk production) period, which lasts from 4 months to 3 years depending on the species, mother otariids alternately forage at sea, where they replenish their fat stores, and nurse their young at breeding sites.  Zoologists had assumed that females of all phocid species, by contrast, use a fasting strategy in which mother phocids, having accumulated large energy stores before they arrive at breeding sites, fast throughout the entire lactation period, which lasts from 4 to 50 days depending on the species.  However, recent studies  on harbor seals, a phocid species, found that lactating females commenced foraging approximately 6 days after giving birth and on average made 7 foraging trips during the remainder of their 24-day lactation period.
It can be inferred from the passage that the females of all phocid species differ from the females of all otariid species in that the female phocids
The author of the passage mentions ringed seals most probably in order to
Information in the passage suggests that David Pearce would most readily endorse which of the following statements concerning monetization?
Which of the following most clearly represents an example of an “ecological service” as that term is used in line 20 ?