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Earn +20 ptsQ: What is half of 21 and 1 half?
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What is half of 21 over 25?
Half of (21 over 25) = 1/2 * 21/25 = 21/50 = 0.42
What is half of 21?
the answer is 10 and 1/2 because half of 20 is 10, but you still have 1 left, so you half that which is 1/2.
What is half of 42?
21
What is half 21?
21/2=10.5 So 10.5 is the half of 21
Approximately what fraction of an original Co-60 sample remains after 21 years?
Half-life is 5.27 years; 21 / 5.27 = 3.99, or almos 4 half-lives; (1/2)4 = 1/16.
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