Please help!! I'll give 5 stars to each answer + thanks!

Solve for x, y, and z. show all steps.

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]

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a