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1. There are n students in a biology class, and only 6 of them are seniors. If 7 juniors are added to the class, how many students in the class will not be seniors?

　　A.n – 3

　　B.n – 2

　　C.n – 1

　　D.n + 1

　　E.n + 2

Correct Answer: D

At first, there are n students in the class, and 6 of them are seniors. It follows that initially n – 6 students are not seniors. If 7 juniors are added to the class, there will be n – 6 + 7, or n + 1, students in the class who are not seniors.

2. What is the equation of the line parallel to the x-axis and four units above the x-axis?

　　A.= –4

　　B.= 4

　　C. –4

　　D.= 0

　　E.= 4

Correct Answer: E

A line that is parallel to the x-axis and four units above the x-axis is the vertical translation of the x-axis four units upward. Since the x-axis is a horizontal line and has equation y = 0, it follows that the line parallel to the x-axis and four units above the x-axis has equation y = 4.

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