A builder is trying to level out some ground with a front-end loader. He picks up some excess dirt at (7, 16) and then maneuvers through the job site along the vectors angleleft−4, 0angleright, angleleft4, 7angleright, angleleft4, 10angleright to get to the spot to unload the dirt. Find the coordinates of the unloading point. Find a single vector from the loading point to the unloading point.