Asked by Clare

half life of a drug in the bloodstream is 14 hours. By what factor does the concentration of the drug decrease in 22 hours?

Answers

Answered by MathMate
The model is an exponential function such that
e^rt=(1/2)
where t=14 hours.

e^(14r)=1/2
14r=ln(1/2)
r=ln(1/2) / 14
=-.04951 (approx).

In 22 hours,
factor=e^(-0.04951*22)
=0.336475 approx.
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