The answer is 489,300.
Work:
We go to the tenth's place, which is 9. Since 9 is higher than 5, we need to round the hundredth's place to 3.
The answer is 6.4×<span>10<span>−<span>5</span></span></span>
The answer will be the last one as it equals 4x + 3. this means that the equation will be parallel and does not have a solution.