What is the rule for 2x^3*4x^5 * means times if you didn't know

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

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?