To find out how much farther Neptune is from Earth than Mars, we need to subtract the average distance from Earth to Mars from the average distance from Earth to Neptune.
The average distance from Earth to Mars is 2.25x10^8 km.
The distance from Earth to Neptune is 4.3514x10^9 km.
To find the difference, we subtract the distance to Mars from the distance to Neptune:
(4.3514x10^9 km) - (2.25x10^8 km)
To subtract the numbers in scientific notation, the first step is to make sure both numbers have the same exponent. We can do this by converting 2.25x10^8 km to scientific notation with the same exponent as 4.3514x10^9 km:
2.25x10^8 km = 2.25x10^9 x 10^-1 km
Now that both numbers have the same exponent, we can subtract them:
(4.3514x10^9 km) - (2.25x10^9 x 10^-1 km)
Next, we can distribute the subtraction operation:
4.3514x10^9 km - 2.25x10^9 x 10^-1 km
Now, we can subtract the numbers that have the same exponent:
4.3514x10^9 km - 2.25x10^9 km = (4.3514 - 2.25)x10^9 km
Calculating the subtraction of the coefficients, we get:
2.1014x10^9 km
Therefore, Neptune is approximately 2.1014x10^9 km farther from Earth than Mars.