8. Catherine and Bridget were participating in a physical fitness
contest. For every 3 sit-ups Catherine
did, Bridget did 5. If Bridget did 80 sit-
ups, how many did Catherine do?

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g