math
posted by hannah .
3. The halflife of a certain drug in the human body is 8 hours how long it would take for a dose of this drug to decay to 0.1% of its initial level?

(1/2)^(t/8) = 0.1
t = 79.72 hours
Makes sense, since .1% = 1/1000
and 10 halflives (80 hours) is 1/1024