_ A'B'C' is a rotation of ABC 180° about the origin. What is the
length of A'C?
A.) 3 units
B.) 4 units
C.) 13 units
D.) 6 units

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?