An expression is shown below: 2x3y + 18xy − 10x2y − 90y part a: rewrite the expression so that the gcf is factored completely. (4 points) part b: rewrite the expression completely factored. show the steps of your work. (6 points)

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