How many blocks with dimensions of One-fourth times 1 times 1 are needed to fill the gap in the prism? A prism has a length of 3 and three-fourths, height of 3, and width of 2. 18 blocks are inside of the prism. 6 12 18 24

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