A pharmacist has 80 milliliters of a 25% saline solution. Which expression can be used to find the percentage concentration of the
final solution if she adds x milliliters of a 10% saline solution?
025(80)+0.17
0.25(80)+0.1X 100
y=
0.25(80)+0.1100
y= 80.0.1%
y 0 25/00) + 0.IX 100
0.25(80)+0.12

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