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What do you have so far?

Well, I don't really understand this topic. How do you find the answer?

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I'm sorry but I don't understand this at all.

Ah I see...okay let me rewind then.
Certain atoms have unstable nuclei. There's a complex interplay of forces keeping the nuclei stable, and certain combinations of protons and neutrons don't last (relatively speaking) very long! Say you have a collection of Uranium-238, a radioactive element. It's radioactive because we know that its nucleus is unstable- each atom, will eventually blow apart. The interesting thing is, not every atom blows apart at the same time.
Rather, the pattern of "atoms blowing apart" or decay, follows a neat little pattern. If you have 200 atoms of Uranium-238, after a certain amount of time t, you'll only have 100 atoms left. When another interval of time t passes, you'll have 50 atoms. This time t is called the half life of the element.
The pattern, visually, is shown below (exponential decay; I'm sure you've encountered it in math class).

I see

Would it be the second choice?

Hmm would you mind sharing your steps?

Well, I multiplied 1620 by 2 and came up with the second choice..

Why 2, though?

I thought you were supposed to multiply it by 2?

Do you multiply it by 1/2?

I'm sorry that I'm making you work double. Thanks for helping me.

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