thomas rented a van for $75 a day plus $.25 for each mile that he would go over 3000 miles. how could Thomas represent the cost see for renting the van for six days and driving for m miles

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