Can you help me please ​

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

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

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.