Use cross multiplication to figure this out. (What does xy = )
.78x/7 = 19/4y

What is the product? (x2+3y+7) [yy+1)

What is the perimeter of square abcd? units units 28 units 37 units

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