Ken likes to build domino trains. he uses boxes of double-six dominoes which contain 28 dominoes. if he built a train with over 500 dominoes, what would be the fewest number of boxes he needed? what operation is needed? what numbers are to be used?

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.