Seven pounds of grapes cost $10.43. How much would 4 pounds cost?

Which of the following best describes the delian problem?

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

20 ! brainliest ! add and simplify your answer.