The x axis is the horizontal (flat, bottom, left-right) axis generally, though sometimes they are manipulated to make math easier.
-the x axis sometimes represents time
The y axis is the vertical (up-down) one.
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The quadratic equation is used to find the intercepts of a function (F(x)=x^(2*n), n being an even number) along its primary axis (typically the x axis). Many equations follow this form. The information given by the quadratic equation depends on what your function is pertaining to. If say you have a velocity vs time graph, when the function crosses the xaxis your particle has changed from a positive velocity to a negative velocity. This information can be useful to determine the accompanying behavior of your position. The quadratic equation is simply a tool to find intercepts of a function.
82
One times one equal one.
one half of one pound
It leave one and one fourth.