Tell me I got a small bick ;)

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

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

Alex measured the length of an item to be 3.7 cm. the actual length is 3.5 cm. what is alex’s percent error?