Answer:
approximately 50,000,000,000
Explanation:
5280 × 5280 is approximately 5000 × 5000 = 25,000,000
12 × 12 is approximately 10 × 10 = 100
Now we have 25,000,000 × 100 = 2,500,000,000
Now we need to multiply by 13, but since we have been rounding all numbers down, let's change 13 to 20.
20 × 2,500,000,000 = 50,000,000,000