Chetan wants to make a necklace with 50 beads. he knows that 12 beads take up 5 inches of string but the store only sells string by the centimeter. how many centimeters should he buy? explain

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