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Natalie recorded the number of heartbeats of cats for different time intervals, on a scatter plot. She drew a line of best fit on the scatter plot, as shown below.
Which statement best describes the meaning of the slope as a rate of change for this line of best fit?
It represents the increase in the heartbeat rate of cats.
It represents the average heartbeat rate of cats, in beats per minute.
It represents the change in heartbeat rate for unit change in time.
It represents the time in which a cat completes a heartbeat cycle.

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