If $x$ is a positive number, by how much does $x+10$ exceed $10-x$? express your answer in terms of $x$.

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

The probability that a college student belongs to a health club is 0.3. the probability that a college student lives off-campus is 0.4. the probability that a college student belongs to a health club and lives off-campus is 0.12. find the probability that a college student belongs to a health club or lives off-campus. tip: p(a or b) = p(a) + p(b) - p(a and b) 0.54 0.58 0.70 0.82

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