Answer:
The answer to the nearest thousandth is 77.759.
Explanation:
First, calculate Neptune's distance from the Sun 4.503 × 10^9 and get 4,503,000,000 then calculate Mercury's distance from the sun 5.791 × 10^7 and get 57,910,000. Then divide 4,503,000,000 by 57,910,000 and get 77.7585909169 but by rounding to the nearest thousandth you get 77.759. In scientific notation, though it would be 7.776x10^1.
Thats it. ;)