In 3/4 pound of Cake mix, there is 2/5 cups of flour. How much flour does the cake mix contain per pound?

Name the most appropriate metric unit for each measurement like the mass of cow

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

Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great