The estimated total cost, y, of a child’s toy is partially based on the number of batteries used, x. the cost of one battery is $0.75. the toy itself costs $12. which equation represents the situation?

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