The domain is about how far left-to-right the graph goes. In relation to the x-axis, the graph starts at x = –3 (with an open circle at –3) and then continues over to the right forever. This is the shown in the picture with the red markup. In interval notation, this is (-3, infinity).
Remember to use that left-to-right orientation for interval notation!
The range is in turn about how low to how high the graph goes. On the graph, I’d do the same thing I did on the red marked up graph and compare the graph to the y-axis. The graph starts down at y = –5 (with an open circle at –5) and then continues on up forever. In interval notation, this is (-5, infinity).
First you must find the slope of the graph. Take the rise/run of the function. The graph starts at 8500 meters and goes down to 7500 meters in 200 seconds. the difference between the change in meters is 1000 meters and the change in seconds is 200 seconds. That is 1000/200. This can be simplified to 5/1 which is 5 meters per second.