8. The width of Christopher's rectangular family room is 3 ft less than the length. The perimeter of the room is
70 feet. Which equation can be used to find the length 1
of the room?

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