Can anyone please help me figure this problem out?

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?

How to simply and write the answer n a whole number

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