Question

The half-life of a certain performance-enhancing drug is 7 days. An athlete takes 300mg of this drug once at the end of each week for 10 weeks.
How much of the drug remains in the body after 10 weeks?

Answer 1

Do you mean 10 weeks after his 10 weeks of taking it, or at the end of the 10 weeks of taking it?

Answer 2

10 weeks taking it, I guess

Answer 3

I'm not actually going to do the work, but you do it by figuring out how much would be left after the first week, second week, etc. and adding it. 300mg * 0.5^10 + 300 * 0.5^9 etc

Answer 4

yeah, I think I get it now.. thank you