The downward tend on a graph is called "decay".
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Trend Graph
When a graph shows a trend that is noticeable. Such as a line or a curve in a certain shape.
The trend of a graph is the slope of any line on the graph that indicated a positive or growth factor and/or a negative or decaying factor. If the slope goes negative, the graph's line will go down thus indicating decay. If the slope becomes positive, the graph's line will go up thus indicating growth.
That means the speed (the slope of the position-time graph) is decreasing.
Average plant height is not affected by the amount of multivitamin.