please help me with this ( make sure you explain and answer correctly ) will mark if you explain thank you. :)

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

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

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.