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You are studying the age of an vase that you are using an element, having a...

You are studying the age of an vase that you are using an element, having a half-life of 100. Originally, that element is present with an estimated amount of 40 grams. You measure an amount of 0.25 grams. Knowing the rate of decay of the element over time is proportional to the square of the quantity left, how old is the vase?

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