Triangle ABC is reflected across line m to form triangle PRS. B

R

A

s

Which statement must be true?

O The length of AB = the length of SR.

O The length of BC = the length of RP.

0 m 4 = m/s

OmZB =mZR

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