On a scale that measures the intensity of a certain phenomenon, a reading of n +1 corresponds to an intensity that is 10 times the intensity corresponding to a reading of n. On that scale, the intensity corresponding to a reading of 8 is how many times as great as the intensity corresponding to a reading of 3?
If money is invested at r percent interest, compounded annually, the amount of the investment will double in approximately 70/r years. If Pat's parents invested $5,000 in a long-term bond that pays 8 percent interest, compounded annually, what will be the approximate total amount of the investment 18 years later, when Pat is ready for college? (A) $20,000 (B) $15,000 (C) $12,000 (D) $10,000 (E) $9,000
If X is the product of the positive integers from 1 to 8, inclusive, and if i, k, m and p are positive integers such that X=2^i 3^k 5^m 7^p, the i+k+m+p= (A) 4 (B) 7 (C) 8 (D) 11 (E) 12
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发表于 2010-7-30 08:47:17
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