Which expression represents the area of a square with a side length of 5?

The area of a square is calculated using the formula ( A = s^2 ), where ( A ) is the area and ( s ) is the length of one side of the square. In this case, the side length is given as 5. By substituting this value into the formula, you compute the area as follows:

[ A = 5^2 = 5 \times 5 = 25 ]

This means the area of the square is 25 square units. Thus, the expression that represents the area of a square with a side length of 5 is indeed 25. This understanding is crucial when solving real-world problems involving area, as well as in various mathematics contexts where area calculations are involved.