The 7th grade and 8th grade students are selling tickets to the talent show. the 8th grade students have sold fifteen more than twice the number of tickets that the 7th grade students have. if they sold 486 tickets altogether, how many did the 8th grade students sell?

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.