Find the excluded values for 9m/m+3

Construct the graph that models the given situation

The longer leg of a 30-60-90 trangle is 18

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?