7. Determina la fórmula que da el termino general en función de n en la siguiente secuencia: 3, 6, 11, 18,… (considera el primer término cuando n=1)​

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