A stalactite and stalagmite are growing toward each other in a cave. The following graph shows the
relationship between the time (in years) since they appeared and the distance (in millimeters) between the
stalactite and stalagmite.
150
Distance between
stalactite and stalagmite (mm)
100-
10 15
Time (years)
What feature of the graph represents the rate of change of the distance between the stalactite and
stalagmite?
This is because The slope tells us the rate of change of the distance in millimeters per year. Because the slope is negative, it means the distance is decreasing.
