Answer: SECOND OPTION.
Step-by-step explanation:
Remember that the area of a square can be calculated with the following formula:
[tex]A=s^2[/tex]
Where "s" is the lenght of any side of the square.
Solving for "s":
[tex]s=\sqrt{A}[/tex]
You know that the area of the square blanket is:
[tex]A_{(blanket)}=144\ ft^2[/tex]
Since this square blanket has 36 square blocks of equal size, you can find the area of each square block:
[tex]A_{(block)}=\frac{144\ ft^2}{36}\\\\A_{(block)}=4\ ft^2[/tex]
Therefore, the lenght of each side of a square block is:
[tex]s_{(block)}=\sqrt{A_{(block)}}\\\\s_{(block)}=\sqrt{4\ ft^2}\\\\s_{(block)}=2\ ft[/tex]
