Explanation and answer or just answer please. First is less and greater second is less and more.

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

What is the inverse of the function f(x) = 2x + 1?

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?