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Bar graphs can compare two sets of data, as well as line graphs and circle graphs. To better improve my answer, double line graphs and double bar graphs compare two sets of data. Circle graphs cannot however, because they compare parts of a whole instead of, as a bar graph would, the amount of something. A circle graph is also incapable of showing data growth over a period of time, as line graphs do. All in all, circle graphs cannot compare to sets of data, and bar graphs and line graphs must be doubled to do so.
Scatter graphs are best. Line graphs are OK if the trend is linear but not much good if the trend is non-linear.
The correct answer is a graph. There are a lot of graphs such as line, bar, and circle, or pie, hat help compare quantities.
Bar graphs and line graphs.
[fx] is a function of x, it usually used in graphs.