to do this you must find the LCD which is 18 to get a denominator from 5/6 you multiple everything by 3 so 15/18 and to get that from 4/9 you multiply everything by 2 so 8/18 then you add 15 and 8 for 23 which would be 23/18 then you do 23 minus 18 which is 5 so it would be b. 1 5/18
