The exponential decay function A = A0(1/2)^t/P can be used to determine the amount A, of a radioactive substance present at time t, if A0 represents the initial amount and P represents the half-life of the substance. If a substance loses 70% of its radioactivity in 500 days, determine the period of the half-life.
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answer: b

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5.7622

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the ten thousandths place is the 2. you round it up if, that number in whatever place is 5 or higher.