Find the difference x+1/x-1-x-8/x-1

Geometry paper. i don't know how to do the rest. questions 5. 8. 9. and 10.

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

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.