Estimating the growth of an online archive

Estimating the growth of an online archive

Secondary 3
5 marks
TGM Original Questions

An online archive contains \(D\) documents \(t\) days after a project begins. A model is \(D=800e^{kt}\). After 4 days the archive contains 1000 documents. Find \(k\) exactly. Use the model to find how many days it takes for the initial number of documents to double, correct to 3 significant figures.[5]

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Answer:\(k=\dfrac14\ln\dfrac54\); \(12.4\) days.

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