What is the meaning of the letters in mathematics?

Enter the number of complex zeros for the polynomial function in the box. f(x) = x+ + 5x² +6

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

30 ! the graph shows the number of siblings different students have. select from the drop-down menus to correctly complete the statement.