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  • 【问题求解PS】

    2x + y = 12│y│≤ 12 For how many ordered pairs (x, y) that 2 solutions of the system above are x and y both integers?

  • 【句子改错SC】

    【OG20-P809-881题】Gusty westerly winds will continue to usher in a seasonably cool air mass into the region, as a broad area of high pressure will build and bring fair and dry weather for several days.

  • 【逻辑CR】

    Since 1990 the percentage of bacterial sinus infections in Aqadestan that are resistant to the antibiotic perxicillin has increased substantially. Bacteria can quickly develop resistance to an antibiotic when it is prescribed indiscriminately or when patients fail to take it as prescribed. Since perxicillin has not been indiscriminately prescribed, health officials hypothesize that the increase in perxicillin-resistant sinus infections is largely due to patients` failure to take this medication as prescribed.Which of the following, if true of Aqadestan, provides most support for the health officials` hypothesis?

  • 【问题求解PS】

    Tanya prepared 4 different letters to be sent to 4 different addresses.  For each letter, she prepared an envelope with its correct address.  If the 4 letters are to be put into the 4 envelopes at random, what is the probability that only 1 letter will be put into the envelope with its correct address?

  • 【句子改错SC】

    【OG20-P810-883题】November is traditionally the strongest month for sales of light trucks, but sales this past November, even when compared with sales in previous Novembers, accounted for a remarkably large share of total vehicle sales.

  • 【问题求解PS】

    【OG20-P156-69题】When n liters of fuel was added to a tank that was already  13    full, the tank was filled to  79  of its capacity. In terms of n, what is the capacity of the tank, in liters?

  • 【逻辑CR】

    A physically active lifestyle has been shown to help increase longevity. In the Wistar region of Bellaria, the average age at death is considerably higher than in any other part of the country. Wistar is the only mountainous part of Bellaria. A mountainous terrain makes even such basic activities as walking relatively strenuous; it essentially imposes a physically active lifestyle on people. Clearly, this circumstance explains the long lives of people in Wistar.Which of the following, true, most seriously weakens the argument?

  • 【逻辑CR】

    Clearbell Telephone provides slow-dialing (SD) service to customers for a low fee, and  fast-dialing (FD) service to other customers who pay a somewhat higher fee. FD technology,  however, is so efficient that it costs Clearbell substantially less per average call to provide than  does SD. Nonetheless, accountants have calculated that Clearbell’s profits would drop if it  provided FD to all its customers at the current low-fee rate. Assume that installation costs for FD are insignificant if the customer already has SD service.  Which of the following, if true about Clearbell, best explains the results of the accountants’ calculation?

  • 【逻辑CR】

    A product that represents a clear technological advance over competing products can generally command a high price. Surprisingly, perhaps, the strategy to maximize overall profit from a new product is to charge less than the greatest price the market will bear. Many companies charge the maximum possible price for such a product, because they want to make as much profit as they can and technological advances tend to be quickly surpassed. The drawback is that large profits on the new product give competitors a strong incentive to quickly match the new product's capabilities.In the argument above, the two portions in boldface play which of the following roles?

  • 【问题求解PS】

    If the sequence x1, x2, x3, …, xn, … is such that x1  = 3 and xn+1 = 2xn – 1 for n ≥ 1, then x20 – x19 = 

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