A baker is baking a three-tiered cake where each tier is centered on the one below it. A diagram of the front of the cake is included below. What is the total area of the front of the cake that the baker would need to cover with frosting? Help me, please.

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