Alicia was rock climbing. she climbed to a height of 30 ft. next , she climbed down 18 ft. finally she climbed up another 55 ft. write an addition expression to describe this situation then find the sum of your addition expression to determine alicia's elevation.

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?