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joja [24]
4 years ago
15

What is 221,000,000,000,000,000,000 expressed in scientific notation? a.2.21 × 1021 b.2.21E20 c.2.21E21 d.2.21E-20 e.2.21 × 10-2

1 f.2.21 × 10-20 g.2.21 × 1020 h.2.21E-21
Mathematics
2 answers:
vodomira [7]4 years ago
8 0

Answer:

The Answer Is <em>B</em> and <em>G</em>

Step-by-step explanation:

I went and clicked all the answers and found out these two were the correct answer.

nekit [7.7K]4 years ago
4 0

Answer:

221,000,000,000,000,000,000 = 2.21 x 10^20

therefore, the answer is b

Step-by-step explanation:

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The half-life of a certain material is 0.004 second. Approximately how much of a 20-gram sample will be left after 0.016 second?
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Answer:

D. 1.25 grams

Step-by-step explanation:

Half-life is: 0.004 sec

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In order to find the material after 0.016 sec, we have to calculate how many number of half-lives have been passed

No. of half-lives passed = 0.016/0.004

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The number of lives passed will be raised to the power of 0.5.

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The answer will be multiplied with the quantity we started with.

Remaining material is:

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Hence, Option D is correct ..

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3 years ago
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3 years ago
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I don't under this Anyone know the answer ?
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X=5
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Answer:

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Step-by-step explanation:

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