Len and kris had dinner in a restaurant. the dinner bill was $18.50. they had to pay a 5% food tax and they left a 15% tip for the waiter. what was the total amount they paid for dinner that night? a. $22.20 b. $3.70 c. $22 d. $22.70

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.