Simplify:
a) (-8) × (-13) × (-9)

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?

If the angle bisectors of a pair of opposite angles of a quadrilateral are the opposite sides of a parallelogram formed by the two angle bisectors and two sides of the quadrilateral, is the quadrilateral always a parallelogram? explain your answer.