Final answer:
The area of a square is equal to the square of its side lengths. Sample correct answers are A) A = (6)(6) square units and B) A = s^2 square units.
Step-by-step explanation:
The area, A, of a square is equivalent to the square of its side lengths. Therefore, the correct options are A) A = (6)(6) square units and B) A = s^2 square units.
Option C) A = (x)(x) square units is also correct, as it represents the area of a square with side length x. Option D) A = (x+x) square units is incorrect, as it represents the perimeter of a square, not its area.