On a certain planet, Continent X has area 6.45×10^8 square miles and Continent Y has area 6.85×10^8 square miles. Which continent is larger? By how many square miles is its area greater?
If we are doing science notation then Continent X would be 645000000 Continent Y would be 685000000 Continent Y is larger You should get 40000000 after you subtract Continent X from Continent Y