Answer:
6
Step-by-step explanation:
Total number of subsets is given as

But the subset of a set consists of the proper subsets, an empty set and the set itself.
Total number of subsets are 64
Therefore,


Comparing both sides

I can see it, it's too blurry and small
Subtract the two numbers to find the measurement of the leftover piece
5.6 - 1.71 = 3.89 feet