graph c is the most appropriate to describe a quantity decreasing at a steady rate.
Find the best graph to explain the amount of steadily decreasing?
If the amount continues to decrease, it means that the amount is decreasing at a constant rate.
If the function decreases by a certain value, the graph of the function becomes a straight line with a decreasing slope.
Graph c only represents a slanted straight line.
The slope straight line has a negative slope. The downhill curve also has a negative slope. Of course, the slopes vary from point to point on the curve, but all slopes along these two curves are negative.
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