a square photo display board is made up of 60 rows of 60 photos each. the area of each square is 4 in. how long is each side of the display board?

90

120

To find the length of each side of the display board, we need to calculate the total area of the board and then find the length of one side.

Given that each photo is a square with an area of 4 square inches, and there are 60 rows of 60 photos each, we can calculate the total area of the display board as follows:

Total area = area of each photo × number of photos

Since each photo has an area of 4 square inches, the total area of the board is:

Total area = 4 in²/photo × (60 rows × 60 photos/row)

Total area = 4 in²/photo × 3600 photos

Total area = 14,400 in²

Now, to find the length of each side of the display board, we can use the formula for the area of a square:

Area = side length × side length

Since the total area of the display board is 14,400 square inches, we can set up the equation:

14,400 in² = side length × side length

Now we solve for the side length:

side length = √(14,400 in²)

Using a calculator, we find that the side length is 120 inches.

Therefore, each side of the display board is 120 inches long.