Answer: 8 billion or 8,000,000,000
====================================================
Reason:
We start with [tex]8 \times 10^9[/tex] which is the same as [tex]8.0 \times 10^9[/tex]
The exponent 9 tells us to move the decimal point 9 spots to the right. If the exponent was negative, then we'd move the decimal point to the left that many spaces.
So we go from 8.0 to 8,000,000,000.0 or simply 8,000,000,000 which is the number 8 billion
Side note: There are 9 zeros in 8,000,000,000
