This graph looks very similar to the famous equation of y equal 1 over x; in either case you get a curve which asymtotically approaches infinity at the y axis where x=0, and which asymptotically approaches zero as x approaches infinity. The difference is that if it is 3 over x, all the values will be three times higher than if it is 1 over x. But the shape of the curve is the same.
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In statistics, a graph and a chart are the same. In arithmetic, a graph is the plot of a function over values. There are no charts.
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If you can differentiate the function, then you can tell that the graph is concave down if the second derivative is negative over the range examined. As an example: for f(x) = -x2, f'(x) = -2x and f"(x) = -2 < 0, so the function will be everywhere concave down.
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-4/12 equals -1/3, which has the pattern of 3's after the decimal point repeat infinitely. That is how -4/12 is a rational number.