Divide. −2 1/2÷ 6 i need the answer soon

Can any one me with the answers to these questions asap?

The legs of a right triangle measure 6 meters and 8 meters. what is the length of the hypotonuse.

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.