The local amusement park charges $19.95 per person. however after 5pm the charge is reduced to $15.40 per person a group of 4 adults is planning to go to the park. how much would they save if they go after 5pm

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