Hey y'all me with this geometry problem, would really appreciate it : )

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

Darian wants to build a regulation size pool table that is 9 feet in length.he plans he ordered are 18 by 36 inches. what is the scale factor of the dilation he must use to build a regulation pool table

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid