A gardener buys two kinds of fertilizer. fertilizer A contains 60% filler materials by weight and fertilizer B contains 40% filler materials by weight. Together The fertilizers bought by the gardener contain a total of 240 pounds of filler materials. which equation models this relationship, we are X is the number of pounds of fertilizer A and Y is the number of pounds of fertilizer B

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