How many liters each of a 35% acid solution and a 85% acid solution must be used to produce 80 liters of a 40% acid solution? (Round to two decimal places if necessary.

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