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?
A store reported total sales of $385 million for February of this year. If the total sales for the same month last year was $320 million, approximately what was the precent increase in sales? (A) 2% (B) 17% (C) 20% (D) 65% (E) 83%
A store reported total sales of $385 million for February of this year. If the total sales for the same month last year was $320 million, approximately what was the precent increase in sales? (A) 2% (B) 17% (C) 20% (D) 65% (E) 83%
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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