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题目： The only gift certificates that a certain store sold yesterday were worth either $100 each or $10 each. If the store sold a total of 20 gift certificates yesterday, how many gift certificates worth $10 each did the store sell yesterday?(1) The gift certificates sold by the store yesterday were worth a total of between $1,650 and $1,800.(2) Yesterday the store sold more than 15 gift certificates worth $100 each.

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题目： Is $$2x- 3y < {x}^{2}$$?(1)$$2x-3y=-2$$(2)$$x >2$$ and $$y >0$$

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题目： If x,y, and z are nonzero numbers, is xz = 12?(1)$${x}^{2}yz= 12xy$$(2)$$\frac{z}{4}=\frac{3}{x}$$

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题目： In the xy-plane, what is the x-intercept of a certain line?(1) The line passes through the point (0,2).(2) The y-intercept of the line is 2.

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题目： What is the value of w + q ?(1) 3w = 3-3q(2) 5w + 5q = 5

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题目： If x is an integer, is 3x + 7 even?(1) (x – 5)(x + 1) = 0(2) x is a factor of 105.

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题目： If n is a positive integer, what is the value of the hundreds digit of $${30}^{n}$$?(1)$${30}^{n} >{1},{000}$$(2)n is a multiple of 3.

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题目： Last year the average (arithmetic mean) salary of the 10 employees of Company X was $42,800. What is the average salary of the same 10 employees this year?(1) For 8 of the 10 employees, this year's salary is 15 percent greater than last year's salary.(2) For 2 of the 10 employees, this year's salary is the same as last year's salary.

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题目： If xyz $$\neq 0$$, is $$x(y+z) \ge 0$$ ?(1)|y+z| = |y|+|z|(2)|x+y| = |x|+|y|

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题目： If $$x >1$$ and $$y >1$$, is $$x<{y}$$?(1)$$\frac{x^2}{xy+x}<{1}$$(2) $$\frac{xy}{y^2-y}<{1}$$

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题目： Does the integer k have a factor p such that 1 < p < k?(1)k>4!(2)$$13! + 2 \le k \le 13! + 13$$

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