Chen is stocking empty shelves at his store with board games. He splits the boxes of board games evenly among 4 shelves. There are 15 boxes on each shelf. Which equation can be used to determine how many board games Chen arranged on the shelves? A. 4 × s = 15 4 × s = 15 B. 15 − s = 4 15 − s = 4 C. s + 4 = 15 s + 4 = 15 D. s ÷ 4 = 15 s ÷ 4 = 15

To which sets of numbers does -12 belong? choose all answers that are correct. a) natural numbers b) integers c) real numbers d) irrational numbers

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297

Ascientist has discovered an organism that produces five offspring exactly one hour after its own birth, and then goes on to live for one week without producing any additional offspring. each replicated organism also replicates at the same rate. at hour one, there is one organism. at hour two, there are five more organisms. how many total organisms are there at hour seven? 2,801 19,531 19,607 97.655