PLEASE HELP TAKING A TIMED TEST Patricia recalls that at sea level that barometric pressure is 1 atmosphere or 760mmHg (or it can be converted to "Pascal" units.) Patricia wonders about the barometric pressure at 8000 feet.

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