Question

The distance of planet Jupiter from Earth is approximately 6.3 ⋅ 108 kilometers, and the distance of planet Saturn from Earth is 1.2 ⋅ 109 kilometers. About how many more kilometers is the distance of Saturn from Earth than the distance of Jupiter from Earth? 5.1 ⋅ 101 5.1 ⋅ 108 5.7 ⋅ 107 5.7 ⋅ 108

Answer 1

1.2*10^9 is the same as 12*10^8. 12-6.3 is 5.7, then you add the 10^8 part, therefore the answer is 5.7*10^8

Answer 2

The correct option is D)
`5.7 * 10^8`

Explanation:

Consider the provided information.

The distance of planet Jupiter from Earth is approximately
`6.3 * 10^8` kilometers.

The distance of planet Saturn from Earth is
`1.2 * 10^9` kilometers.

Add or subtract scientific number:

It is necessary to manipulate two numbers in the scientific notation so that their bases have the same exponent.

Consider the provided numbers
`6.3 * 10^8` and
`1.2 * 10^9`

The number
`1.2 * 10^9` can be written as
`12 * 10^8`

Now the exponent of the both numbers are same, so simply subtract the numbers as shown:

`(12-6.3) * 10^8`

`5.7 * 10^8`

Hence, the correct option is D)
`5.7 * 10^8`