Respuesta :

gcf mean great common factor 
so between 14abc and 28a^2b^2c^3 the great common factor will be 

between 14 and 28 is 14 
btw. a and a^2 is a
btw. b and b^2 is b
btw. c and c^3 is c 
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so the gcf will be 14abc

hope helped