In a game of tug of war, your team changes -1 and 3/10 (-1.3) feet in position every 10 seconds. What is your change in position after 30 seconds? I said -3.9 but apparently was wrong. What am I missing?
The only thing I see missing from your response is a unit of measurement, i.e., the change of position would be -3.9 ft. Perhaps they only want the magnitude of the change, as distances are defined to be non-negative lengths.
If we use the relationship between distance, constant speed, and time: