What is the formula for inflation 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.

Michael gose to a theme park and rides two different roller coasters that both begin on a raised platform his height while on the first roller coaster measured in feet from the platform height can be modeled by the following graph where t is the number of seconds since the ride began

Wesley is making patio from stones of two sizes, 5 inches wide and 10 inches wide. he wants to begin and end his pattern. with a 10-inch so there will be one more of the 10-inch stones than of the 5-inch stone. his patio will be 130 inches wide how many 10-inch stones will wesley need for one row ?