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2.5 x 109 is wrong.
2.5 x 109 would be "2500000000
The correct answer is 2.5 x 1010 or 25 x 109 (But this would not be in true scientific notation). Scientific notation is basically calculated by how many times you would move the decimal point (as a result of multiplying by 10). As follows.
2.5 x 109 = 2500000000
2.5 x 1010 = 25000000000
Not sure how old this question is but thought i would answer anyway.
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Earn +20 ptsQ: What is the scientific notation of 25000000000?
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