So sorry to be a bother very confused on how to work this out if a radioactive element has a half-life of 2 hours, then x grams of the element dwindles to x/2 after 2 hours.

If a nuclear reactor has 1200 grams of that radioactive element, find the amount of radioactive material after 8 hours. ​

Two language majors, anna and megan, took exams in two languages. anna scored 85 on both exams. megan scored 74 on the first exam and 85 on the second exam. overall, student scores on the first exam had a mean of 82 and a standard deviation of 4, and the second exam scores had a mean of 71 and a standard deviation of 13. a) to qualify for language honors, a major must maintain at least an 85 average across all language courses taken. so far, which of anna and megan qualify? b) which student's overall performance was better?