iodine-131 is a radioactive isotope that is a by-product of emissions of other radioactive isotopes. after the 2011 earthquake in japan that damaged server also nuclear reactors, high levels of iodine-131 were found near the nuclear power plants. iodine-131 has a half life of 8 days. if authorities found an original sample of 2.5 grams right after an emission from the plant, how much iodine-131 would be left 30 days later?

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression

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

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?