URGENT. Please help me, I don’t know! What is the answer to this, PLS help this is really urgent !

If you could answer these your a life saver

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

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?