Which step is part of a proof showing the opposite sides of parallelogram abcd are congruent?
a) show that ac is congruent to bd
b) show that ad is congruent to ab
c) show that angles a and d are supplementary
d) show that triangle adb is congruent to triangle cbd

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