Please help me out, i need it right now. please help me

Joanie watched 1 out of three of a movie in the morning

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

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation. which method should jeremy use?