Bus A and Bus B leave the bus depot at 6 am. Bus A takes 20 minutes to complete its route once and bus B takes 35 minutes
to complete its route once.
If both buses continue to repeat their route, at what time will they be back at the
bus depot together?
Assume the buses have no breaks in between routes,
Give your answer as a 12-hour clock time.

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