What the equation n how do u find it please help 20 point please please help

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

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

Find the domain and range of the following function f(x) = 51x - 21+ 4