Please help me and explain. Make it easy to understand.

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

Aline passes through 3,7 and 6,9 what equation represents the line

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