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Alex777 [14]
3 years ago
7

The half-life of helium-5 is 7.6 × 10-22 seconds, and the half-life of helium-9 is 7 × 10-21 seconds. Approximately how many tim

es greater is the half-life of helium-9 than that of helium-5?
Mathematics
2 answers:
ozzi3 years ago
4 0
(7 × 10-21) / (<span> 7.6 × 10-22) = 9.21 times greater</span>
bearhunter [10]3 years ago
4 0

Answer C, 9 Times greater

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A. T= d/r
A good way to remember this is by making a pyramid with 3 parts and putting distance at the top and rate and time in the other two parts. This way you can visibly see the equation and use it if you need to find one for rate.

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3 years ago
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djyliett [7]

Answer:

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