Roby spent two months traveling in country a. the day she arrived, the exchange rate was 1.3 country a dollars per country b. complete (a) and (b)
(a) if she exchanged 500 country b dollars when she arrived, how many country a dollars did she receive?

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z