Tomas works as an underwater photographer. he starts at a position that is 15 feet below sea level. he rises 9 feet, then descends 12 feet to take a photo of a coral reef. write and evaluate an expression to find his position relative to sea level when he took the photo

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