Take my points since im quitting

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

If i have 20$ and i gave 5$ away how much i got

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