Anne bought a necklace for each of her three sisters. she paid $7 for each necklace. suppose she had $9 left. write and solve an equation to find how much money anne had initially to spend on each sister.
i need it can't figure it out.

Andy wants to find the distance d across a river. he located points as shown in the figure, then use similar triangles to find that d = 223.5 feet. how can you tell without calculating that he must be wrong? tell what you think he did wrong and correct his error. round your answer to the nearest tenth if necessary. andy must have used the wrong . the distance d is actually feet.