Cho hệ các vector U ={(1,2,9);(0,-1,-8);(2,3,10);(1,0,- 7)}
Tìm số chiều và một cơ sở W của không gian con sinh bởi hệ vector U

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?