单项选择题

a■b=(a+b)(a-b)（）

A. if Quantity A is greater;
B. if Quantity B is greater;
C. if the two quantities are equal;
D. if you cannot determine the relationship based on the given information.

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单项选择题

In the series N1 , N2, N3 , N1=-1, and Nx+1=-1 Nx+x].（）

A. if Quantity A is greater;
B. if Quantity B is greater;
C. if the two quantities are equal;
D. if you cannot determine the relationship based on the given information.

单项选择题

If x+y=16, and if x2-y2=48, then x -y=（）

A. 3
B. 4
C. 6
D. 32
E. 36