Explanation:
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Explanation/Answer:
Wind turbines are more likely to be found near rural communities due to the large requirement for space.
Via half-life equation we have:

Where the initial amount is 50 grams, half-life is 4 minutes, and time elapsed is 12 minutes. By plugging those values in we get:

There is 6.25 grams left of Ra-229 after 12 minutes.
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