Is there any outliers here? If so what are they. 78,158,63,71,56,67,75

Which system of linear inequalities is represented by the graph?

What is the range? can’t seem to find it out

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