A company has a monthly profit, or gain, of $6,400. The next month they have a loss of $4,700. What expression would you use to find the difference in profit between the two months?

-4,700 - 6,400
6,400 - 4,700
6,400 - (-4,700)
4,700 - 6,400

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