Question On Pic Thx!

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

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a