Tìm một cơ sở của hạt nhân của ánh xạ tuyến tính f: R^3 --> R^3 xác định bởi f(x, y,z) = (x +y -z, x - 3y + z, x - y).

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.