A fisherman in a stream 45 cm deep looks downward into the water and sees a rock on the stream bed. How deep does the stream appear to the fisherman? the index of refraction of the water is 1. 33.

Make them both to where they have the denominator of 18that makes 3/2 equal 27/18 and 1/9 equal 2/18so now you have  27/18x+5=2/18subtract 5 from the other sideso now you have 27/18x+2/18-5then subtract 2/18 from 27/18 to get 25/18x=-5then divide 25/18 by -5 and your answer will be  -5/18