单项选择题

If A is the point (-4, 1) and B is the point (2, 1), what is the area of the circle which has AB as a diameter

(A) 3π
(B) 6π
(C) 9π
(D) 12π
(E) 36π
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单项选择题
If the average (arithmetic mean) of 10, 20, 30, 40, and x is 60, what is the value of x
(A) 50
(B) 60
(C) 100
(D) 150
(E) 200
单项选择题
D
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