ANSWER
[tex]2.7715 \times {10}^{3} \: million \: miles[/tex]
EXPLANATION
The distance from Mercury to the sun is 28.5 million miles.
The distance of Neptune from the sun is 2.8 billion miles.
We know that,
1 billion=1000 million.
Therefore,
2.8 billion = 2800 million
The distance between Mercury and Neptune is
2800-28.5 million miles.
=2771.5 million miles
We rewrite this in scientific notation as,
[tex]2.7715 \times {10}^{3} \: million \: miles[/tex]
or
[tex]2.7715 \times {10}^{0} \: billion \: miles[/tex]
