Kim starts with $500 and spends $15 per week. Her brother Roy starts with $800 and spends $35 per week. Write the inequality for when Kim will have more money than Roy. Use x to represent the number of weeks.

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