Joe swam the entire length of the pool, which is represented by the fraction 1.
To find the fraction of the length of the pool that Joe swam, we need to compare the distance he swam to the total length of the pool.
Let's say the length of the pool is 10 units. If Joe started swimming at point 0 and swam all the way to the other end of the pool, he would have swum a distance of 10 units. So, the fraction of the length of the pool that Joe swam is 10/10, which simplifies to 1.
Therefore, Joe swam the entire length of the pool, which is represented by the fraction 1.
The probable question may be: "Joe is swimming one lap across the length of a pool. He started swimming at the point marked 0. What fraction of the length of the pool did Joe swim?
A. 1/2
B. 3/4
C. 1
D. 1/3"