If a circle has a diameter of 24 inches, which expression gives its area in square inches?

A. 12^2 • pi
B. 12 • pi
C. 24 • pi
D. 24^2 • pi

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