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Minsui, I'm sorry you haven't gotten a response. It is hard to answer your question, because we cannot see the function the question is asking about and we never see where the 7 appears in the function.
Keep in mind that, although we usually think of x as horizontal position and y as vertical position or height, this is not always correct. There are many things we graph that might come out differently. The horizontal axis represents the independent variablewhat we observe or measure. The vertical axis is a dependent variablewhat we calculate or what we find corresponds to the value of the horizontal axes.
There are many situations where a vertical position would be an independent variable and would be plotted on a horizontal axis; for example, if we measure air pressure versus height. We would plot it as (h, p).
In the formula they give,
y=a(xh)^2 + k,
k will represent the vertical position of the maximum point in distance above the ground. h will represent the _positive_ displacement of x, or how far away from x horizontally the maximum point will occur.
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