Can someone help me!

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]

Which expression is rational? 6. , square root two, square root 14, square root 49

What is the approximate value of  x  in the equation below.–3.396–0.7080.3040.955