Select a set of values for x. For each value calculate the value of f(x). On a graph paper, mark the points [x, f(x)].
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The graph of the function f(x) = 4, is the horizontal line to the x=axis, which passes through (0, 4). The domain of f is all real numbers, and the range is 4.
[fx] is a function of x, it usually used in graphs.
They are the same thing, Casio calls it FX-115ES in some countries, such as the U.S., and FX-991ES in most other countries. I believe this has to do with model name recognition. "FX-115" has been used in various U.S. models for a long time.
the five graph is line graph,bar graph,pictograph,pie graph and coin graph