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  3. For each of Questions 1 to 9, compare Quantity A and Quantity B, using additional information centered above the two quantities

For each of Questions 1 to 9, compare Quantity A and Quantity B, using additional information centered above the two quantities

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问题 For each of Questions 1 to 9, compare Quantity A and Quantity B, using additional information centered above the two quantities if such information is given. Select one of the following four answer choices and fill in the corresponding oval to the right of the question.
(A)Quantity A is greater.
(B)Quantity B is greater.
(C)The two quantities are equal.
(D)The relationship cannot be determined from the information given.
A symbol that appears more than once in a question has the same meaning throughout the question.

选项
答案C
解析 In this question you are asked to compare s2 with. Since it is given that st =, it follows that(st)2 =()2 , and s2t2 = 10. Dividing both sides of the equation s2t2 = 10 by t2, you get s2=. The correct answer is Choice C.
    You can look at this problem in another way. You can use the fact that st =to express Quantity A in terms of t. Since st =, it follows that s =, and Quantity A is equal to, which is the same as Quantity B. The correct answer is Choice C.
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