Wich expression is equivalent the the expression shown

What is the square root of 45? (step by step working plz)

You have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint? you have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint?

With number 11 ( show how you got the answer)