PLEASE HELP URGENT DUE TODAY

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

If the discriminant if a quadratic equation is 4 which statement describes the roots?

Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.