Andre must pay a co-pay of $15 for an office visit. his insurance company will then pay 80% of the cost of the visit. how much will andre pay for an office visit that costs $310 $62 $65 $77 $80

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