Answer: 3,500,000,000
Work Shown:
The x means "multiplication"
(7 x 10^2)(5 x 10^6)
(7 x 5)(10^2 x 10^6)
35 x 10^(2+6)
35 x 10^8
(3.5 x 10^1) x 10^8
3.5 x (10^1 x 10^8)
3.5 x 10^(1+8)
3.5 x 10^9
3,500,000,000
There are 8 zeros after the "3,5" portion.
This number is 3.5 billion. Another way to say it would be to say "3 billion, 500 million".
To go from the scientific notation 3.5 x 10^9 to the final answer, we move the decimal point 9 spaces to the right. If the exponent was negative, then we would move 9 spaces to the left.