James needs to buy shirts for his business. Company C charges customers a one-time $50 printing fee plus $10 for every shirt. Company D charges a one-time $20 printing fee plus $15 for every shirt.
Which inequality can be used to find s, the minimum number of shirts that can be purchased so that the total charge at Company C is
less than the total charge at Company D?
50s + 10 > 20s + 15
50s + 10 < 20s + 15
50 + 10s < 20 + 155
50 + 10s > 20 + 158

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