Show steps how to get this pls. 4K-6= -2k - 16-2

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

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 expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b