I would say: The dresses on the rack in the back of the department was on sale. Since it's asking which sentence uses a verb that agrees with its subject. Dresses is a verb! I hope this helps!
The angle measures tell you the triangles are similar, so corresponding sides will have the same ratio. GX/BX = UH/NH GX = BX·UH/NH GX = 7·18/(3√11) GX = (42/11)√11
