it means timetables
they tell you where you are
Probably a misspelling of "coordinates".
English and maths
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It relates to maths because coordinates show where you need to go when your lost
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degree with maths\computer science\electronics as one optional subject and final year is elgible to apply
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.
The authors of some textbooks label certain exercises optional to imply that they don't have to be completed, but serve to give students and readers extra practice should they want it. Of course, whether they are optional or not depends on certain factors. If you are doing them by your own choice, then they're optional (i.e. you can choose not to do them). If a teacher tells you to finish them as homework, then the exercises lose that "optional" factor.