Which expression is not a polynomial?

Me find the measure to side a and the process to solve the problem you appreciate it : )

Apath 3 m wide runs around the inside of a square park inside 60 m.find the area of the path.pls

Beth took out a $20,000 loan for college she is borrowing money from two banks. bank a charges an interest rate of 8.5% bank b charges and interest rate of 10.5% after one year alice owes $1860 in interest how much money did she borrow from bank a