I think it's c because of the Iroquois
Sorry I don’t quite get the question. Could you rephrase it?
Answer: The third sentence is correct.
<em>In scientific notation, you move the decimal place until you have a number between 1 and 10. Then you add a power of ten that tells how many places you moved the decimal.</em>
<em>In scientific notation, 39,940,000 becomes 3.994 × 10^7</em>
