A substance has a half-life of 3 years. If 2000 grams are present initially, how much will remain after 1.5 years?

Answer 1

1414 grams

Decay can be modeled with an exponential decay: #2000(1/2)^n # n would be time passed in years or number of half lives completed. 1.5 years is 1/2 of the half life so we will put n as 1/2 to get 1414 grams. To sig figs if necessary, 1000g
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Answer 2

After 1.5 years, 1000 grams will remain.

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Answer from HIX Tutor

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.

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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