the surface area of a right rectangular prism is 2f+2t+2r where f is the area of the front face, t is the area of the top face, and r is the area of the right side face. Show how to use the expression to find the surface area.

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