PLEASE HELP I ONLY HAVE AN HOUR also I have more so if you could go answer the others that would be great

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

How can you construct perpendicular lines and prove theorems about perpendicular lines

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle