Respuesta :
It's b I know I have it right because I put it into my calculator
(5.91 * 10^-3) * (8.7 * 10^10) =
(5.91 * 8.7) * (10^-3 * 10^10) =
51.417 * 10^7.....which is the same as 5.1417 * 10^8
(5.91 * 8.7) * (10^-3 * 10^10) =
51.417 * 10^7.....which is the same as 5.1417 * 10^8