Final answer:
The length of each side of Ashley's square bulletin board, with an area of 196 cm², is calculated by taking the square root of the area, which is 14 cm.
Step-by-step explanation:
To find the length of each side of Ashley's square bulletin board, we need to take the square root of the area because the area of a square is equal to the side length squared. The area given is 196 cm², so the side length is the square root of 196 cm². This calculation gives us the length of each side:
√(196 cm²) = 14 cm
The length of each side of Ashley's square bulletin board is therefore 14cm, which corresponds to option B)