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1-68.

Look at each graph below and write a story or description about what each graph shows.

1. Look at both sides of the graph. On the $y$-axis is speed and on the $x$-axis is time.

To know what this graph shows, you have to look at the line and describe it according to speed and time.

The graph shows a steady increase in speed.

1. See the hints in part (a).

The graph shows a quick increase in speed then levels off at certain speed.

1. See the hints in part (a).