What is the proportional reasoning of 3/5 = a+5/25

What is the value with a place of tenths in 907.456 1) 0 2) 6 3) 4 4) 5

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

With finding limits of multi variable !