You can't; you'd have to have a second measurement of feet.
[Feet is linear distance; logically, there must be a second dimension to make it two dimensional.]
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To convert feet to square feet, you need to multiply the number of feet by itself. Since you have 5280 feet, multiplying 5280 by itself gives you 27,878,400 square feet.
To convert 7920 miles to feet, you would use the ratio 5280 feet/1 mile. Multiply 7920 miles by this ratio to get the equivalent distance in feet.
The area of the farm in square feet is 9 miles * 5280 feet/mile * 1.5 miles * 5280 feet/mile = 71,608,320 square feet. To convert this to acres, divide by 43560 (since 1 acre = 43560 square feet), so the farm is approximately 1644 acres.
A square mile is equal to 5,280 feet by 5,280 feet, which means there are 27,878,400 square feet in one square mile.
There are 2,722,560 square feet in 2 square miles. This is because there are 27,878,400 square feet in one square mile, so multiplying by 2 gives us 55,756,800 square feet in 2 square miles.
To convert feet to miles, divide by 5280 (1 mile = 5280 feet). To convert hours to miles per hour, divide distance in miles by time in hours. Thus, to convert 30000 feet to miles per hour, first convert feet to miles (30000/5280), then divide by the number of hours to get miles per hour.