The average distance from Earth to Mars is 2.25×10^8 km, and the distance from Earth to Neptune is 4.3514×10^9 km. How much farther is Neptune from Earth than Mars? Express your answer in scientific notation. Do not round your answer

Answer 1

To find the difference in distance, we subtract the distance from Mars from the distance from Neptune:

4.3514×10^9 km - 2.25×10^8 km

To subtract these numbers, we need to have them in the same scientific notation.

We can write 2.25×10^8 km as 0.225 × 10^9 km, since 2.25 = 0.225 × 10.

Now we can subtract the distances:

4.3514×10^9 km - 0.225 × 10^9 km

= (4.3514 - 0.225) × 10^9 km

= 4.1264 × 10^9 km

So Neptune is 4.1264 × 10^9 km farther from Earth than Mars.