The diameter of the sun is about 1.4 x 10^6km. the diameter of the planet neptune is about 50,000km. which expression best approximates the ratio of the diameter of the sun to the diameter of neptune A - 3.6 x 10^2
B - 2.8 x 10^1
C - 2.8 x 10^2
D - 3.6 x 10^-2

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