Point F on the coordinate grid is reflected across a line to create point F. Then, points E, F, and F are connected to create a triangle. Kari says point E must be on the perpendicular bisector of the line
FF, regardless of the line across which point F was reflected.

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