Which expressions represent the distance between the two points?
choose all answers that are correct.
the number line shows two points with coordinates negative 9 and positive 13.
a.
|–9 – 13|
b.
|13 – (–9)|
c.
|–13 + 9|
d.
13 – (–9)

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