they tell you where you are
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it means timetables
The average of the x coordinates of the point(s) is the x coordinate of the mid point, The average of the y coordinates of the point(s) is the y coordinate of the mid point, and so on, through 3, 4 dimensions, etc.
yes. to understand the higher maths you need pre algebra
To estimate numbers more easily.
Information on indices maths can be found on the Laerd Mathematics website. There are many examples of formulas which one may find informative and useful.