# The half-life of chromium-51 is 28 days. If you start with 640 g, how much will be left after 56 days?

The mass left after

Consequently,

After "56" days, the mass that remains is 160g.

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Utilizing the exponential decay formula, we can calculate the amount of chromium-51 that will remain after 56 days: Amount remaining = Initial amount * (1/2)^(time elapsed / half-life) Substitute the following values: Amount remaining = 640 g * (1/2)^(56 days / 28 days) Amount remaining ≈ 640 g * (1/2)^(2) Amount remaining ≈ 640 g * (1/4) Amount remaining ≈ 160 g After 56 days, roughly 160 grams of chromium-51 will remain.

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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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