I can't see or interpret graphs directly. However, I can guide you on how to analyze a graph to answer your questions based on general concepts:
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Constant Velocity: Look for a straight horizontal line on the graph. This indicates constant velocity since the position does not change over that interval.
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Decreasing Graph: Identify the segments where the graph is sloping downward. These intervals where the graph is declining indicate that the velocity is decreasing.
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Velocity After 20 Minutes: Check the point on the graph that corresponds to 20 minutes along the time axis and read the corresponding value on the velocity axis.
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Domain: The domain of a function is the range of input values (time, in this case) that the graph covers. Look at the starting and ending points along the time axis to determine the domain.
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Linear or Nonlinear: If the graph consists of straight lines (including horizontal), it's linear. If it curves or has changes in slope, it's nonlinear.
If you have the specific details of the graph, feel free to share them, and I can provide more precise guidance!