Tanya buys 3 cases of soda. each case of soda contains 12 cans. tanya drinks 6 cans of soda. sammy writes a numerical expression to represent the situation. his expression, (12-6)x3 has a mistake. part a: explain sammy's mistake. part b: write an expression to find how many bottles of soda are left, and then solve it.

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.