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Answer:
(a) The car travels the same distance per unit of time because the portion shows a linear, increasing function.
Explanation:
The description of portion I is ...
I starts at the origin and is a straight line slanting up
This best matches the answer choice ...
The car travels the same distance per unit of time because the portion shows a linear, increasing function.
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When you describe the graph, as opposed to showing the graph, your description often will answer the question directly--as it does here.