Answer: 18.38 feet
Explanation:
Hi, to answer this question we simply have to solve the expression √338, which is the length of the wire. 
Mathematically speaking: 
√338 = 18.3847 feet 
Since the number after the hundredths place is less than 5: 
Length of the wire: 18.34 feet (rounded to the nearest hundredth) 
Feel free to ask for more if needed or if you did not understand something.