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Element X has a half-life of 6 days. If we currently have a 21 ounce sample of Element X, how long will it be

Element X has a half-life of 6 days. If we currently have a 21 ounce sample of Element X, how long will it be until only 6 ounces remain? ROUND YOUR ANSWER TO 2 DECIMAL PLACES. After about days, only 6 ounces will remain.

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