A drug is eliminated from the body through urine. Suppose that for a dose of 10 milligrams, the amount A(t) remaining in the body t hours later is given by A(t) = 10(0.9)t and that in order for the drug to be effective, at least 2 milligrams must be in the body. (a) Determine when 2 milligrams are left in the body. (Round your answer to two decimal places.)(b) What is the half-life of the drug? (Round your answer to two decimal places.)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section: Chapter Questions
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A drug is eliminated from the body through urine. Suppose that for a dose of 10 milligrams, the amount A(t) remaining in the body t hours later is given by

A(t) = 10(0.9)t

and that in order for the drug to be effective, at least 2 milligrams must be in the body.

(a) Determine when 2 milligrams are left in the body. (Round your answer to two decimal places.)

(b) What is the half-life of the drug? (Round your answer to two decimal places.)
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