can some one PLEASE solve these i am brain dead and it is important for my grade (please give ACTUAL answers!!!)

Select the correct answer from the drop-down menu. subtracting 3xy^2 from 8xy^2 gives the same result as the expression. [tex]3xy ^{2} - 8xy ^{2} [/tex][tex] { - 7xy}^{2} - {2xy}^{2} [/tex][tex] {7xy}^{2} - {2xy}^{2} [/tex]

For what value of (y) is 3^3/3^y =1/9

Could somebody me with this radical simplification?