Jasper is planning a kayaking trip on the river. the length of river he plans to navigate is 7.2 miles. at the end of his trip, he checks his watch and sees that it took him 1 hour and 36 minutes. what was his rate of speed down the river?

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