# An original sample of K-40 has a mass of 25.00 grams. After #3.9 xx 10^9# years, 3.125 grams of the original sample remains unchanged. What is the half-life of K-40?

In the half-life equation, use the rate constant (k).

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The half-life of K-40 is approximately 1.25 billion years.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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