Which table represents a linear function?

The parking lot of a store has the shape shown. all angles are right angles. what is the area of the parking lot?

What is the approximate total length of iron edging needed to create the square frame and the two diagonals?

In triangle abc segment de is parallel to the side ac . (the endpoints of segment de lie on the sides ab and bc respectively). find de, if ac=20cm, ab=17cm, and bd=11.9cm;