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17 June, 00:49

Will give brainliest!

What percentage of a substance remains after 7 half-lives have passed?

2.5

1.25

0.78

0.39

+2
Answers (2)
  1. 17 June, 02:14
    0
    The answer should be 0.78
  2. 17 June, 02:17
    0
    0.78

    Explanation:

    Source: Just took the Test
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