3/8 + 4/5 answer i have a test tommorow

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?

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

When a 757 passenger jet begins its descent to the ronald reagan national airport in washington, d.c., it is 3900 feet from the ground. its angle of descent is 6 degrees. how far must the plane fly to reach the run way? a. 37,106 ft b. 37,310.4 ft c. 23,456.6 ft d 2,492.7 ft