Can i get a correct answer bc i already asked this on and didn't get the correct answer that was listed

What is the value of the expression below? (81^2)^1/8

David must install fencing around a lot that is shaped like a right angle. the side of lot that runs east-west is 200 ft long. the side of the lot runs north-south is 125 ft long. calculate how many feet of fencing he will need to surround the entire lot.

Adiverr from the university of florida women’s swimming and diving team is competing in the ncaa zone b championships