Geometry worksheet please help

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =

Find the rate of change for the situation. you run 7 miles in one hour and 21 miles in three hours.

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