Respuesta :

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