On a certain planet, continent X has 7.82×10⁷ square miles and content Y has area 6.91×10⁷ square miles. Which continent is larger? By how much square miles is its area greater?

To determine which continent is larger, we compare their respective areas:

Continent X: 7.82×10⁷ square miles
Continent Y: 6.91×10⁷ square miles

Comparing the two values, we see that Continent X is larger by 0.91×10⁷ square miles.

Therefore, Continent X is the larger continent, and its area is greater by 0.91×10⁷ square miles.