In 1803, the United States paid France about $15,000,000 for the Louisiana Purchase. What is 15,000,000

expressed in scientific notation?

The Louisiana Purchase has been described as the greatest real estate deal in history. In 1803 the United States paid France $15 million for the Louisiana Territory--828,000 square miles of land west of the Mississippi River. The lands acquired stretched from the Mississippi River to the Rocky Mountains and from the Gulf of Mexico to the Canadian border. Thirteen states were carved from the Louisiana Territory. The Louisiana Purchase nearly doubled the size of the United States, making it one of the largest nations in the world.