Element X is a radioactive isotope such that every 12 years, its mass decreases by half.

1 answer:

6 0

Answer:636

Step-by-step explanation: I just kno

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eduard

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Well, AEB is 28, and CED is 65,and you want to add them, so that would be 65+28, which equals 80+13=93, so the answer is b.

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