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5.7 x 10⁸ = 570,000,000 Choice A.

Choice B. 57,000,000 would have been 5.7 x 10⁷
Choice C. 5,700,000,000 would have been 5.7 x 10⁹
Choice D. 5.70000000 would have been 5.7 x 10⁰

This is the scientific notation :-   5.7 10^8

We move the decimal 8 places to the right. 

570,000,000 = 5.7 10^8

Answer: a. 570,000,000

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