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The scale in a graph is determined by the range of the dependent and independent variables.
The answer depends on what the graph displays.
No, it is impossible.
graph
Recent information suggests that the Siberian Tigers' numbers have grown to nearly 600 in the wild.
distance and time
Slope of the graph will give you speed.
Google: "panda population graph"
BAR GRAPH!
It depends on what information is plotted.
They both are increasing.
To make a good graph title, just state what your graph is about. If the line graph (example) shows the population of England, your graph title should be 'Population of England Over Time'.