My parents met on January 1st 1998, my mother was born on May 18th, 1975, my father was born on February 14th 1974. At what date has my mom known my father for longer than she lived before meeting him.
At what date has my dad known my mother for longer than he lived before meeting her.
Thank yall for the help!

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