The following three proportions can all be used to solve the problem about Caroline's salary. Explain why the solutions to each proportion are the same. 36
4
=
x
7

4
36
=
7
x

36
x
=
4
7

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