Anne is working on a research project that involves the use of a centrifuge. her samples must first experience an acceleration of , but then, the acceleration must increase by a factor of five. by how much will the rotational speed have to increase? express your answer as a fraction of the initial rotation rate.

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.