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题目： For any numbers x and y, x◇y = 2x - y - xy. If x◇y = 0, then which of the following CANNOT be y?

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题目： A store's selling price of $2,240 for a certain computer would yield a profit of 40 percent of the store's cost for the computer. What selling price would yield a profit of 50 percent of the computer's cost?

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题目： In the figure shown, two identical squares are inscribed in the rectangle. If the perimeter of the rectangle is $$18\sqrt2$$, then what is the perimeter of each square?

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题目： If wz < 2, is z < 1?(1)w > 2(2)z < 2

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题目：

According to the "conventional view" referred to in highlight text of the passage, brighter carotenoid-based coloration in certain species suggests that an individual

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题目： The author of the passage asserts that "the real GDP is almost always higher than ever before" (see highlighted text) most probably in order to

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题目： If $${9}{x}={27}^{y}$$, which of the following expresses x in terms of y?

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题目： At an auction, each of the bids on a certain clock after the first bid was $100 greater than the immediately preceding bid. What was the amount of the last bid on the clock?(1) The first bid on the clock was $450.(2) The fourth bid on the clock was $300 less than the amount of the last bid.

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题目： During a spring season, a certain glacier surged at the rate of 1 mile per 100 days. What was its rate in feet per hour? (1 mile = 5,280 feet)

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题目： Is x greater than y ? (1) $${x}-{y}^{2} >{0}$$ (2) xy <0

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题目： If $${x}^{2}={4}$$ and $${y}^{2}={7}$$, then $${x}^{6}-{y}^{4}=$$

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题目： A box contains exactly 24 balls, of which 12 are red and 12 are blue. If two balls are to be picked from this box at random and without replacement, what is the probability that both balls will be red?

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题目： Is t greater than v ?(1) t is greater than 3.(2) v is less than 5.

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题目： If $$N = \frac{1}{3} + \frac{1}{(3^2) }+ \frac{1}{(3^3)}$$, then N is between

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题目： If x and y are integers, what is the value of $${2}{x}^{6y}-{4}$$ ?(1) $${x}^{2y}={16}$$(2) xy = 4