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  3. What is the value of t? (1)The average (arithmetic mean) of t2 and 8t is -8 (2)=2

What is the value of t? (1)The average (arithmetic mean) of t2 and 8t is -8 (2)=2

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问题 What is the value of t?
(1)The average (arithmetic mean) of t2 and 8t is -8
(2)=2
选项 A、Statement (1) ALONE is sufficient, but statement (7) alone is not sufficient to answer the question asked.
B、Statement (2) ALONE is sufficient, but statement (6) alone is not sufficient to answer the question asked.
C、BOTH statement (1) and (7) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient.
D、EACH statement ALONE is sufficient to answer the question asked.
E、Statement (1) and(7)TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
答案A
解析 单独(1)t2+8t==8×2，即(t+4)2=0，因此t=-4，所以单独(1)能够回答问题；单独(2)得到t=±2，t的值不唯一，因此单独(2)不能够回答问题；所以A为正确答案。
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