An experiment yields one of five sample data points: a, b, c, d, and e. if p(a) = p(c), p(b) = .1, p(d) = .2, and p(e) = .1, what's p(c)?

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