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题目： If$$\frac{1}{x} = 0.4$$, then $${1}\over{x+2} =$$

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题目： If $$y = \frac{x}{5}$$ , then what is the ratio of 2x to 3y ?

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题目： A helicopter company charges $85 for the first kilometer of a trip and $5 for every kilometer after that. If the total cost of a trip was $365, how many kilometers were flown?

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题目： In the xy-coordinate system, line k passes through points (-5m, 0) and (0, 2m). Which of the following is a possible equation of line k?

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题目： In the xy-coordinate system, points (2, 9) and (-1, 0) lie on line k. If the point (n, 21) lies on line k, what is the value of n?

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题目： If $$ k \neq 0$$ and $$k \neq±1$$, and $$({k^{3}*k*k^{4}})^{2}\over{k^{n}*k}$$=$$k^{14} $$, then n =

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题目： In the xy-coordinate system, line k has y-intercept 12 and an x-intercept greater than zero. If the area of the triangular region enclosed by line k and the two axes is 30, what is the slope of line k?

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题目： In the infinite sequence 13, 17, 21, 25, 29, . . . , where each term is 4 greater than the previous term, the 46th term is

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题目： If the line passes through the origin, what is the value of k?

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题目： If $$2^{A} = 3 and 2^{B} = 5, then 2^{2A + B} =$$

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题目： In a group of children, the average (arithmetic mean) weight of the boys is 60 pounds, and the average weight of the girls is 48 pounds. If the average weight of all of the children in the group is 50 pounds, what is the ratio of the number of boys to the number of girls?

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题目： k is a positive number. If k is twice its reciprocal, and j is twice k, then jk =

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题目： To create paint with a certain shade of gray, one must combine 2.016 liters of black paint with every one liter of white paint. Approximately how many liters of white paint must be combined with 350 liters of black paint to create the certain shade of gray?

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题目： What is the decimal equivalent of$$(\frac{2}{5})^{5}$$?

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题目： If $$f(x) = x^{2} + 4$$ and f(2k) = 36, then which of the following is one possible value of k?