A
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It is an exponential function.
The best fit line is basically the average of a graph; it represents where, when, etc. the majority of the event occurred.
Bar graph
A
Line Graph
a bar graph is best used for comparing amounts, a line graph best represents a steadily increasing value. For example prices of a shirt (line graph), or viscosity of liquids (bar graph).
The area that best represents it
Distance and time
A discrete graph. A discrete graph is a visual function that displays data that generally represents counts of things.
A logarithmic graph would best represent the relationship between stream velocity and the size of particles it can carry downstream. As velocity increases, the stream can carry larger particles due to increased erosion and transport capacity. However, there will be a limit to the size of particles carried downstream as velocity continues to increase.
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Velocity change vs Time
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It is an exponential function.
It would help to have the graphs to choose from!