Can someone plz help me plz and thank u

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]

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

Which expression gives the exact value of x?