Trong mặt phẳng Oxy cho 2 điểm A(2;-4), B(1;0) phép tịnh tiếp vecto OA biến điểm B thành B' , khi đó B' có tọa độ

Acable company claims that the average household pays $78 a month for a basic cable plan, but it could differ by as much as $20. write an absolute value inequality to determine the range of basic cable plan costs with this cable company. a. |x − 78| ≥ 20 b. |x − 20| ≥ 78 c. |x − 20| ≤ 78 d. |x − 78| ≤ 20