Please help ill give u brainlest there are 1-6 boxes

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Which equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?