Someone please help me with 2

Solve this and show you’re work step by step ! -5 3/4+3h< 9 1/4 -

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

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