399,713 rounded to nearest thousand

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

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