D. a piece of a line that starts at the endpoint and extends indefinitely in one direction
think of an arrow with a dagger on one end! :)
The magic of the internet will help!
Simplified the answer is in decimal form 0.00000026.
G(f(x)) = g(2x +7) = -3(2x +7) +9 = -6x -21 +9
g(f(x)) = -6x -12
