F the sales representative is able to get 20% of the prospective customers to subscribe, the maximum expected number of subscriptions per week is . If the sales representative earns $3 per subscription in addition to daily wages, the minimum expected value of the extra income per week is .

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