Agray whale traveled 152 kilometers in one day. the whale swam between 7 and 8 kilometers each hour. about how many hours did it take the whale to swim the distance? show two different ways that you can use compatible numbers to find an answer. then solve.

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