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In 1919, H. S. Reed and R. H. Holland published a paper on the growth of sunflowers. Included in the paper were the table and graph above, which show the height h, in centimeters, of a sunflower t days after the sunflower begins to grow. Over which of the following time periods is the average growth rate of the sunflower least? |
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Answer» Day 0 to Day 21 Alternate approach: The average growth rate of the sunflower over a certain time period is the slope of the line segment that joins the point on the graph at the beginning of the time period with the point on the graph at the end of the time period. Based on the graph, of the four time periods, the slope of the line segment is least between the sunflower’s height on day 63 and its height on day 84. Choices A, B, and C are incorrect. On the graph, the line segment from day 63 to 84 is less steep than each of the THREE other line segments representing other periods. Therefore, the average growth rate of the sunflower is the least from day 63 to 84. |
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