et cetera simply means "and so on". Maths is not really related to "and so on".
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it means, "Et cetera".
20 and 8. 19 and 9. 18 and 10. Et cetera.
any negative number is an integer less than zero, such as -10, -4, et cetera.
There are pentagons, hexagons, heptagons, octagons, et cetera.
Rocks are related to math because of geology and in geology you use math.