Element u has a half life of t billion years. find the half life of this element if 1/6 of the original amount is left after 11.55478 billion years.

Find the area of a square with a side length of 1/4 in.

Which number line represents the solution set for the inequality -1/2x> 24?

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