Enjoy this longer full flight tutorial in Flight Factor's Airbus A350-900XWB. We start at Gate B3 in Seattle, WA in a cold & dark cockpit and end up touching down nicely in Anchorage. I do my best to explain what I am doing in a fashion that a novice can understand. Hopefully this video helps. Formula for finding the runway slope is as follows:
Find the difference between the elevations for both ends of runway. Then take that figure and divide it by the runway length in feet and multiply it by 100 to find the runway slope.