Final answer:
The correct answer to how much farther Uranus is from the Earth than Saturn is D) 1.67 x 10^9 km.
Step-by-step explanation:
The question asks to calculate the difference in the distances from the Earth to Uranus and from the Earth to Saturn to determine how much farther Uranus is from the Earth than Saturn. To find this, we must subtract the two given distances. Earth is 287 x 107 km from Uranus and 12 x 108 km from Saturn. First, we should express these numbers in standard form to make the subtraction easier. The distance to Uranus becomes 2.87 x 109 km, and the distance to Saturn is already in a consolidated exponent form as 1.2 x 109 km.
To find out how much farther Uranus is from the Earth than Saturn, we subtract the distance to Saturn from the distance to Uranus: (2.87 x 109 km) - (1.2 x 109 km) = 1.67 x 109 km. Therefore, the correct answer is D) 1.67 x 109 km.