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The function A = Age-0.00866x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number

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The function A = Age-0.00866x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 800 pounds of the material are placed in the vault, how much time will need to pass for only 218 pounds to remain?

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