Given a square with the area of 16in^{2}. Find the length of each side of the square.

The picture below shows the square with sides of length L.

Since the value of the area is given as 16in^{2}, we can substitute A with 16 as shown below:

Now, we have L^{2} = 16. Since L square is a multiplication of L twice, we can find L by taking the square root of 16. This is shown below:

Now, the calculated number 4, has no meaning until we include the unit for it. Since the area is in in^{2}, L will be in inch. Hence:

Therefore, the answer is B.

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