need help please I cant find the answer

Answer:61/3Step-by-step explanation:Similar trianglesThe corresponding side on triangle A is 18 units18 * 1/3 = 6The side length of the missing side on B is 6 unitsSide B                5------       =    -----------   = 1/3Side A              15The ratio is 1/3

Answers:question one:  6question two: 1/3==========================================Explanation:The side 12 from triangle A corresponds to the side 4 from triangle B.The scale factor is A/B = 4/12 = 1/3 which tells us that sides in triangle B are 1/3 as long compared to sides in triangle A. This takes care of the second question. We'll use this scale factor to determine the missing side of triangle B.The side 18 in triangle A corresponds to this missing side in triangle B.Take 1/3 of 18 to get (1/3)*18 = 6 which is that missing side.--------------Another way to look at it: Take any side of triangle B, triple it, and you'll get a corresponding side of triangle A.Example: The jump from 5 to 15 is "times 3".