Final answer:
The correct answer to finding the length of each side of a square garden with an area of 100 square feet is 10 feet, as you must take the square root of the area (100) to find the length of the side.
Step-by-step explanation:
When determining the length of each side of a square with an area of 100 square feet, we must use the formula for the area of a square which is area = side × side or, equivalently, side^2 = area. To find the length of the side, we take the square root of the area.
Thus, the correct answer is: B) 10 feet because you take the square root of 100. This is because each side of a square is the same length, and the area of the square is equal to the length of one side squared. Since 100 is a perfect square, the square root of 100 is 10, therefore each side of John's garden would be 10 feet long.
The incorrect options are: A) 50 feet - it does not apply because simply dividing the area by 2 does not give the length of a side in a square. C) 25 feet - each side is not one-quarter of the area in a square, and D) None of the above is not correct since option B is the right answer.