amount of chemical (mg) O 1,000 800 C 600 400 O800 mg 200 0.5 week 1 week O200 mg 1.5 weeks 2.5 weeks 600 mg 2 weeks since measurement (w) 2 weeks © 400 mg 3 weeks 3 What is the approximate half-life of the chemical? Explain how you know.

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