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Mathematics 10 Online
OpenStudy (anonymous):

The half-life of a certain radioactive material is 68 hours. An initial amount of the material has a mass of 641 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 4 hours. Round your answer to the nearest thousandth. Can someone give me the equation to start this I could solve it if I had the equation.

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