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Answer: to determine the amount of carpet to buy for a room </h2><h2 />
Square units are units for measuring surface areas (width by length).
In this sense, the best example is:
<em>to determine the amount of carpet to buy for a room</em>
Because for this, you need to know the length and width of the carpet to know if it fits well in the area of the room.
The other options are incorrect, because:
-<em>to determine the distance you ran</em> and <em>to determine the amount of fencing needed for your backyard</em> refers only to measure <u>length</u>.
- <em>to determine the amount of water in a pool</em> refers only to measure <u>volume</u>