Can someone help me with this please. It’s geometry

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

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

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function