Write the following numbers in Scientific Notation.
1. The current United States national debt is about $26.5 trillion.
2. The speed of light is about 299,000,000 meters/second.
3. The diameter of an atom is approximately 0.0000000001 meters.
4. Suppose you want to download a file that is 2.6 gigabytes. If you have an average download speed of 30 megabytes/second, how long will it take to download the file?