Which determinants can be used to solve for x and y in the system of linear equations below? -3x+2y=-9 4x-15y=-25

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

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

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