Solve for [x]. The pair of polygons are similar. The scale factor from A to B is 9:10

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x

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