### Instruction: Luke wants to fence a square piece of land of at least 400 square feet. What should the side of the square be if he wants to use the least amount of fencing?### Response: To minimize the amount of fencing, Luke should make the square as small as possible, while still having an area of at least 400 square feet.
The area of a square is the square of its side, so I can write an equation: s^2 = 400, where s is the side of the square.
To solve for s, I can take the square root of both sides: s = sqrt(400).
The square root of 400 is 20, so the side of the square should be 20 feet.