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题目： Kepler's Third Law expresses the relationship between the semi-major axis of a planet's orbit and its orbital period: the further a planet's orbit is from the Sun, the longer the planet's period of revolution around the Sun.

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题目： If the integer k is a multiple of 3, which of the following is also a multiple of 3 ?

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题目： $$\frac7{\frac15}+\frac5{\frac17}=$$

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题目： Company A has a total of n employees, where n is an odd integer, and no two employees have the same annual salary. The annual salaries of the n employees are listed in increasing order, and the 16th salary in the list is the median of the annual salaries. If the sum of the annual salaries of Company A's employees is $942,400, what is the average (arithmetic mean) of the annual salaries of Company A's employees?

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题目： Lines m and n intersect, as shown in the figure above. What is the value of u - w?(1)u = 90(2)Lines m and n are perpendicular.

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题目： If $${a}_{1}={1}$$ and $${a}_{n+1}={1}+\frac{1}{a_n}$$ for all $$n \geq 1$$, what is the value of $${a}_{5}$$ ?

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题目： Is the sum of the integers x and y a prime number?(1)x is an even prime number.(2)y is a prime number between 10 and 20.

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题目： Working at their respective constant rates, machine A makes 100 copies in 12 minutes and machine B makes 150 copies in 10 minutes. If these machines work simultaneously at their respective rates for 30 minutes, what is the total number of copies that they will produce?

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题目： Is ax = 3-bx?(1)x(a + b) = 3(2)a = b = 1.5 and x = 1

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题目： If $$xy\neq0$$, is $$\frac x y=1$$?(1)$$x^2=y^2$$(2)$$xy >0$$

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题目： $$(\frac {1}{4-\sqrt{15}})^{2}=$$

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题目： If 4x + 3y = -2 and 3x + 6 = 0, what is the value of y?

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题目： If $$5x = 2y$$ and $${x}{y}≠{0}$$, then x is what percent of y?

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题目： A rectangular circuit board is designed to have width w inches, perimeter p inches, and area k square Inches. Which of the following equations must be true?

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题目： A certain machine produces 1,000 units of product P per hour. Working continuously at this constant rate, this machine will produce how many units of product P in 7 days?