Ryan is building a tree house. He has 18 feet of wood to use. He uses three-fourth
of a foot of wood to make each step for
the ladder. If he has 15 feet of wood left,
how many ladder steps did he make? How do I show my work ?

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.