To answer your questions accurately, I would need to see the graph you are referring to, as the context of the questions heavily relies on visual data such as velocity-time graphs. However, I can provide general guidelines for interpreting a velocity-time graph:
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Constant Velocity: A constant velocity is indicated on a graph by a horizontal line segment. This means that the velocity does not change over that interval of time.
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Decreasing Graph: A graph is decreasing when the line slopes downwards as it moves from left to right. This indicates that the velocity is decreasing over that time interval.
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Velocity After 20 Minutes: To determine the velocity at a specific time (such as after 20 minutes), you would look at the point on the graph that corresponds to the 20-minute mark. The y-coordinate of that point will give you the velocity.
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Domain: The domain of a function in the context of a graph typically refers to the set of possible input values (in this case, time). You would identify the time interval depicted on the graph (e.g., from 0 to 30 minutes).
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Linear vs. Nonlinear: A graph is linear if it forms a straight line; it is nonlinear if it curves or has bends. For instance, if the velocity changes at a constant rate, the graph will be linear; if the velocity changes at different rates, it may be nonlinear.
If you can provide specific data from the graph or describe its features, I would be able to give more detailed answers to your questions!